salt burn |
-
the brown or black leaf or leaf edges that appear when
the plant is exposed to excessive amounts of a form of
chemical salts such as granular
fertilizers. Water moves from low concentrations of
salts toward high concentrations. Therefore, when a
clump of a salt compound comes into close proximity to plant
tissue, it pulls all the water out causing the cells to
collapse and the tissue to
"burn" or turn brown.
A similar reaction occurs when fresh (uncomposted)
manure come into contact with plant roots. When
composted over time, the salts in the manure are leached
out by rain water.
Dog urine has the same effect on
turfgrass. |
samara |
- an indehiscent, single-seeded, dry, winged
fruit found on plants such as elms (Ulmus)
or
maples. |
sand |
- mineral soils are composed of particles of sand,
silt
and clay. Sand is the largest of the particles at 0.05
to 1.0 millimeter in diameter. With such big particles, it
provides large air and water pores and is extremely well
drained. Sand particles have a low
CEC which means that
they do not hold on to
nutrients well. |
sanitation |
- often times, giving the garden a good cleanup in the
fall is a fine way to prevent
insect and
disease
problems. Many
insects and disease over winter on or in
the debris left over from the current year's growth.
If you have experienced a serious insect or disease
problem, identify the organism and determine how it
spends the winter. If it hides as an adult, lays eggs or
develops spores on the abandoned leaves or stems, you
may benefit from removing these from the garden after
they have been killed by a frost in the fall.
In extreme cases, this may also include sterilizing
the soil to kill organisms in the soil. This is a
process that is most often done with harsh chemicals
that can only be applied by licensed companies. They are
too dangerous for use by the typical homeowner. |
sapwood |
- this is the "new" wood found just inside the cambium
layer on a dicotyledon
type of tree. It is lighter colored than the
heart wood which is
closer to the center of the trunk. Sapwood is also still
live cells that are involved in the movement of water up
the tree and sap down the tree in the
xylem and
phloem cells.
|
saturated |
- a term to describe the situation when all the pores in
the soil are filled with water. This excludes the needed
air spaces and, if it persists over a long time, may
cause the death of roots and encourage root rot. |
scaffold branches |
- these are branches that extend out laterally from the
main trunk of a tree. This term is most often used for
fruit trees where scaffold branches are chosen for their
location and strength for supporting a crop of fruit. |
|
|
scape |
- (aka flowerscape) usually refers to the entire stem
that bears a complete set of flowers. In
hostas, it is
the stem that has a complete set of flowers on a single
division. The scape tends to arise directly from the
crown of the plant in the ground. |
scarification |
- some plant species produce very hard seed. In nature, this
results in some of the seed staying in the ground for several
seasons before germinating. This spreads out the risk that seeds
will germinate and emerge during a bad year which could result
in all of them dying. Scarification is a process where the
seed is artificially softened or the seed coat is opened
slightly so that all the seeds
will germinate at once. Seeds may be scarified by soaking them
in hot water or a mild acid solution. They may also be notched
with a fingernail file or sandpaper to break the seed coat and
allow water to enter. |
scientific name |
- (aka Latin or Greek name) the
system of naming plants developed by
Carol Linnaeus whereby
every
plant or animal type has a specific name consisting of two parts
(binomial nomenclature), the
genus and
species. An example would
be
Hosta sieboldiana. |
scion |
-
grafting involves the combination of two plants into
one. The upper part of the graft is called the scion.
In
the case of
hybrid tea roses, this would come from the
plant that has the beautiful flowers but roots that are
not winter hardy.
The lower part of the graft is
called the rootstock or stock. In hybrid tea roses, this
would be from some "wild type" of rose that is extremely
winter hardy but does not produce beautiful flowers.
|
scorch |
- this is a symptom that shows a browning of the edges
of leaves. It is most commonly the result of excessive
heat or insufficient water from the root system. |
secateurs |
- a French word used by British gardeners for hand pruners or pruning shears. |
seed coat |
- the protective outer layer of a seed. |
|
|
seedling |
- a plant grown from a seed and
therefore, the result of sexual reproduction. It is not a clone. |
seeds |
- the result of the combination of
the pollen from a male reproductive organ (stamen) with the egg
of the female reproductive organ (pistil). Plants grown from
seeds may display phenotypic variations that will not be evident in plants
reproduced asexually (divisions, cuttings,
tissue culture, etc.).
The
seeds of hostas are dark brown or black when they are ripe. They
may be planted immediately after harvest or may be stored in a
freezer for later sowing. |
seersuckering |
- a leaf
characteristic caused by the gathering of tissue between the
veins giving the leaf a "bubbled" effect as if thread had been
pulled out of a piece of material. |
selective pesticide |
-
a
pesticide that will be toxic to some organisms but not to
others. A common example is broadleaf
herbicides which
will kill dandelions and other broadleaf weeds but will
not bother grasses. |
selfing or selfed |
-
(aka self-pollination) refers to the movement of
pollen from the
stamen
to fertilize the eggs in the
pistil of the SAME plant.
This may result in the expression of recessive traits of
the parent plant. |
self-fertile |
-
describes a plant that can he pollinated by its own
pollen or
that of another plant of the same variety. |
|
|
self-infertile
or self-unfruitful |
-
describes a plant that cannot he pollinated by its own
pollen or
that of another plant of the same variety.
Apple trees, for instance,
must have at least two different
cultivars in the
vicinity to produce
apples.
A red delicious tree cannot pollinate itself or another
red delicious tree. |
self-pollination |
- describes a plant that has been pollinated by its own
pollen. Generally, this
refers to the situation where a hybridizer manually
takes the pollen from the stamen and transfer it to the
pistil of the same plant. Although it still mixes two
sets of genetic materials, being from the same plant, it
should result in offspring that do not vary much from
the mother plant. |
self-sterile |
- See self-infertile |
semi-evergreen |
- a plant that is evergreen in its preferred climate
zone but may lose some of its foliage in colder or
warmer zones. |
senescence |
- when something senesces, it is getting ready to die.
Herbaceous plant parts above ground go into senescence
late in the season. |
sepals |
- a modified leaf at the outermost layer of the flower.
The
sepals are collectively called the
calyx and act as a protective covering for the inner
flower parts when they are in the bud. Sepals are
usually green, but in some species they are the same
color as the petals. In
this case, the combination of the sepals and petals is
called tepals. Hostas have
tepals in their flowers.
In
some groups of plants sepals are absent or may consist of
bracts.
|
serrate |
- a leaf having sharp forward-pointed teeth on the margin. |
sessile |
- plant parts like flowers, leaves or fruit which are
attached directly to the plant without any stem,
peduncle,
pedicel or
petiole. |
|
|
sexual reproduction |
- in plants, it is the combination of the
pollen from a male
reproductive organ (stamen) with the egg of the female
reproductive organ (pistil) resulting in the production
of seeds. This results in the combination of the genetic
material (genotype) from two plants (except in the case of
self-pollination) which results in
phenotypic variability in the
seedlings. |
shearing |
- refers to non-specific pruning of plant foliage with
hedge shears. It cuts everything back to a specific
height without regard to buds. Shearing should be
limited to hedges, topiary, or where a
formal garden is
to be maintained. |
shoot |
- usually refers to a single stem with leaves that
emerges from a
bud on the
crown in the ground. |
shot hole |
- certain fungal or
bacterial leaf spot
diseases will weaken
the tissue on a leaf so much that the tissue drops off in
the wind. This leaves a small opening in the leaf called a
shot hole since they often resemble a leaf that has been
shot with a shotgun. |
short day (SD) |
- a plant requiring exposure to short days (often less
than 12 hours) to initiate production of flower buds. In
fact, it is often the amount of darkness that is
important. Many of these plants need to be exposed to
more than 12 hours of total darkness to trigger
bud
formation. See Long-Day
Plant, Short-Day Plant
and Day Neutral Plant |
|
|
shrub |
- although not a precise definition, it generally refers
to woody plants that have several stems originating from
the ground and no
distinct single trunk. Images of
Shrubs. |
sign |
- when diagnosing a plant problem, we can look for signs and
symptoms. A sign is an indication of the presence of the
causative agent. For instance, holes in a leaf are signs of
feeding by an insect. A mushroom is a sign that a fungus is at
work.
See Symptom |
signal word |
- warning words required on
pesticide labels which give a
relative indication of the product's toxicity. The signal words are either “Danger
Poison” for highly toxic compounds, “Warning”
for moderately toxic, or “Caution” for slightly toxic
materials. |
silt |
- mineral soils are composted of particles of sand, silt and
clay. Silt are intermediate sized particles that are smaller
than sand and larger than clay. |
simple leaf |
- most plants have simple leaves which consist of a
petiole
(leaf stalk) and one leaf blade.
See
compound leaf. |
skeletonizing |
- a sign that describes the damage done to a leaf by insects.
Beetles often feed on the tissue between the veins of the leaf.
Eventually, all that is left of the leaf are the veins which
make it appear like a skeleton. |
|
|
slow release |
- used to describe a fertilizer that is not very water soluble
and, therefore, releases its
nutrients to the soil slowly. These
fertilizers are often coated in clay, plastic-like compounds or
other materials which must be broken down by weathering or by
microorganisms before the nutrients inside are released to the
soil. |
slugs |
- these are mollusks which are best
described as snails without shells. They crawl along on a slime
trail to keep themselves moist and love an environment that is
cool, moist and has decaying organic matter. Slugs are the
number one pest of hostas
because they too prefer a cool, moist environment. Slugs generally feed at night and chew holes in
the leaf blade and may also feed on the petiole of
hostas.
More
on Slugs... |
small size |
- according to the
The American Hosta Society, there are
five size categories of
hosta including
Giant,
Large,
Medium,
Small and
Miniature. Small
hostas form a clump that is 6
to 10 inches in height. |
soaker hose |
- generally a hose with very porous walls that will
allow water to gently seep out over time. They save
water use by applying water only near the root zone of
plants and help prevent
diseases by not getting the
foliage wet. |
soil |
- often the uppermost layer of the earth's surface which
consists of disintegrated rock (parent material) and
organic matter (humus and living organisms).
More
on Soil... |
soil heaving |
- the alternating expansion and contraction of soils (especially
those with high clay content)
caused by
freezing and thawing conditions during the winter. In the process,
plant roots may be damage and, in some cases, recently
planted perennials may be pushed (heaved) out of the ground. |
|
|
soil pore spaces |
- spaces or cavities in the soil not occupied by
solid particles. These are the places for air and water
in a healthy soil. There should be about 25% by volume
of air space and 25% by volume of water space in the
ideal soil for plant growth. |
soil structure |
- the physical composition of soils which expresses
itself in terms of soil horizons.
More
on Soil Profile... |
soil test |
- an analysis of a soil sample to determine the level of
nutrients, soil type, pH and other chemical parameters.
More on
Soil Tests. |
softscape |
- all the living elements i.e. plants, fish, in a
landscape.
See hardscape. |
softwood cuttings |
-
propagation
method in which the plant segments for rooting are
collected during the current growing season from
new growth that has not matured or hardened off
significantly.
See
Hardwood Cuttings. |
soluble salts |
- salt is a class of chemical compounds that has the
characteristic of attracting water into it. For the
gardener, it is of concern because most
fertilizers and
fresh animal manures have high levels of soluble salts.
When a clump of salt or fresh manure comes into contact
with roots or other plant tissue, it will quickly draw
the moisture out of the plant and into the salt. This
will cause the plant cells to collapse, the tissue to
die and turn brown. This rapid dehydration is commonly
called a "burn." |
|
|
somatic |
- relating to the cells in the "body" of the plant
rather than in the reproductive tissue. The variegation
in many plant leaves exists only in the somatic tissue
and is, therefore, not transferred to the next
generation through seed. These variegated plants can
be reproduced by division or
tissue culture and will
maintain their variegated tissue. They generally may NOT
be reproduced in the same form from seed. |
sp. |
- (plural
= spp.) when only the genus of a plant is known,
the abbreviation, sp. is used if it refers to a single
species. If the reference is to two or more species, the
abbreviation, .spp is used.
For example, if you are referring to all the species
of Hosta, you would use Hosta spp. The name of
the genus is capitalized and italicized or underlined
while the sp. or spp. is not. |
sphagnum moss |
- a type of coarse textured, long fibered
peat moss that is often
used during plant
propagation since it contains a
chemical that appears to suppress the
fungal disease,
damping off. It is also used to line wire baskets used
for annuals and ferns. |
spatulate |
- a leaf or plant part shaped like a spatula i.e. rounded more or less
like a spoon. |
|
|
species |
- in the hierarchy of the
binomial nomenclature system,
plants are grouped because they share certain
characteristics. The most closely related plants are in
the species, a little broader grouping is the
genus and
the next wider group is the family.
Generally, members of the same species will interbreed
freely. To qualify as a species, there must be
evidence that the plant currently lives or once lived in the
wild. Some hosta "species" have been discovered to have never
existing outside of cultivation by humans. Therefore, what was
once a species called Hosta fortunei has been changed to
cultivar status as Hosta 'Fortunei'
Although it is a little confusing, a species name
consists of the genus name and a specific epithet which
may be a descriptive word or a latinized version of
someone's name. For example in the species,
Acer palmatum (Japanese maple), Acer is
the genus and palmatum (palm like leaves) is the
specific epithet.
|
specimen |
- a term indicating a special plant in the landscape.
This may be due to size or another unique
characteristic.
In Hosta, it
is often used to refer to a Giant
size plant greater than 28 inches in height. |
speckled |
- a leaf, stem or seed pod that has
small spotted irregular coloring. |
spider mites |
- tiny, eight legged critters that suck the juices from many
plants in the landscape. Since they have more than six legs,
they are not
insects and certain insecticides will not work on
them. Mites are related to spiders but, technically, are not
spiders. They do, in large populations, spin webbing around
plant parts. Populations of spider mites will often suddenly
explode on a plant and may disappear with the next pounding
rainfall. They are often found feeding on the bottom of leaves. More on
Spider Mites. |
spider
shaped flowers |
-
a flower with narrow, widely spaced petals that open upward and
resemble the spread out legs of a spider. |
|
|
spike |
-
a narrow flower inflorescence that is usually longer than
it is wide with small flowers borne along one main stem. |
splashed or
streaked |
- a form of variegation with many non-connected
light and dark colored sections
often in streaks running nearly parallel to the midrib
of the leaf.
In
hostas, this
type of variegation is usually considered unstable since it will
often revert to the solid colored form. There are a few
cultivars that are very stable, however,
such as H. 'Spilt
Milk'. Streaked plants must be
used as the mother parent in cross-breeding of hostas to produce
variegated seedlings. |
spore |
- reproductive body of fungi and other lower plants,
containing one or more cells: a bacterial cell modified
to survive an adverse environment;
sporulate means to produce spores |
sport |
- one way that new cultivars
are originated is through a naturally occurring mutation or
chimeral rearrangement
that is genotypically (genetically) or
phenotypically
(physically) different from the original plant.
In
hosta, a single
bud on a clump may produce a single division with a
different color or variegations pattern. This sport can be
separated from the clump and, if it remains stable i.e. does not
revert to the original form in future seasons, and has unique characteristics, it may be
introduced as a new cultivar. |
spot treatment |
- spraying for weeds in only parts of the lawn that are
infested rather than treating the entire lawn is an
example of spot treatment. Also, treating only areas of
a plant infested with damaging
insects rather than
applying to the entire tree. |
spur |
- very short lateral branch where flower
buds
develop and fruit eventually forms. Most common in some
types of
apples and crabapple trees. |
|
|
stable |
- refers to a hosta
(or other plant) that maintains its solid or
variegated pattern over time. This is often an issue with
streaked or splashed hosta variegation
which
tends to be unstable and prone to reversions. In this case, such
plants may change or "stabilize" into a single colored
plant or one that has either
medial (center)
or marginal
variegation while the streaked appearance is lost. This
may happen to the entire plant or just a single division
may revert to another form but the remainder of the clump keeps
its original form. |
stamen |
- male part of a flower consisting of a
filament or stem and a
capsule like structure at the top called the
anther which produces the
pollen.
Hybridizers
manually move the pollen from the male parent
to the
pistil of the female parent when cross-breeding
Hosta,
Hemerocallis (daylilies) and other plants.
The number of stamens per flower varies by plant
species and
hostas usually
have six
stamens per flower.
|
standard |
- 1) may apply to a typical example of a
species or
cultivar that other plants may be compared to for
identification. 2) certain plants such as fruit trees,
roses,
geraniums and others may be grown on top of an
elongated stem. Sometimes this is accomplished by
grafting a plant on top of a long stemmed
rootstock.
Other standards may be created by treating the plant
with gibberellins to cause the plant to develop an
unnaturally tall main stem.
3) in
Iris species, this is the name for the upright
petals of the flower. |
sterile |
- the inability of the eggs
in the
pistil or the pollen in the stamen to complete
fertilization and form viable seeds.
Hybrid plants resulting
from the cross-pollination of two different species may result in a
sterile progeny. Sterile hostas will flower but will not set
seed pods on the flowerscape like fertile plants. |
sticker |
- ingredient added to spray or dust to improve its
adherence to plant leaves and stems. |
|
|
stigma |
- the female reproductive organ of a plant is called the
pistil. It consists of a stigma,
style and ovaries. The
stigma is the sticky knob on the top of the stem (style)
that leads down to the ovaries. It is the place where
the pollen lands to begin the process of fertilization
during sexual reproduction.
|
stipe |
- in ferns, this is the slender stalk that supports the
frond. |
stipule |
- a pair of lateral appendages that look like small
leaves that emerge from the base of the leaf
petiole in
certain plants such as Japanese Flowering Quince (Chaenomeles). |
stolon |
- a horizontal stem above the surface of the
soil, that takes root at the
nodes which touch the ground.
Strawberries send out stolons (runners) from the
mother plant to produce new plants.
This term is often used incorrectly for plants that
spread by a rhizome which is
an underground stem. Quackgrass spreads by rhizomes.
Some
hostas send out rhizomes which are below the ground
stem modifications.
|
stoleniferous |
- a plant that spreads by stolons. See
stolon. |
stoma |
-
(plural = stomata) an opening on
the bottom of leaves which regulates the exchange of
gases between the plant and the atmosphere. They have
small organs on each side of the opening called guard
cells which are capable of opening and closing in
response to certain stimuli. Water vapor moves through
the stoma which helps regulate water flow through the
plant and cools the plant through evaporation. Carbon
dioxide intake and oxygen discharge happens primarily in
the stomata too. |
|
|
stomach poison |
- a
pesticide that must be eaten by an
insect or
other animal in order to kill it. |
stratification |
- some plant
species produce
seeds which must be exposed to one or more periods of
cold, moist conditions before they can germinate. In
nature, this happens most often in tree species which
normally drop their seeds to the forest floor in the fall
to
germinate the following spring after spending the winter
buried in cold, moist leaf mould. This is smart because,
if the seeds germinated when they dropped to the ground
on a warm autumn day,
they would probably be killed by the cold of the winter.
Stratification usually involves storing the seeds in
moist peat moss at temperatures of about 40°F
(refrigerator) for 1 to six months. The length of time
may vary from species to species and you should consult
a resource to find the requirements of your particular plant.
Of course, you can also just plant the seeds outdoors
in the fall and let nature take its course. However, you
lose control over the seeds and they just might
disappear to become food for a squirrel. |
streaked |
see
splashed |
striped
flowers |
- some Hosta species or cultivars have purple stripes on
their flowers. |
strobilus |
- this is the name for the flowers of conifer trees or
shrubs. The male flowers are slender similar to the
catkins on
birch trees. The
female flowers look like
miniature cones. Since they generally have separate male
and female flowers, conifers are either
monoecious or
dioecious. |
style |
- the female reproductive organ of a plant is called the
pistil. It consists of a
stigma, style and ovaries. The
stigma is the sticky knob on the top of the stem (style)
that leads down to the ovaries at the bottom.
|
sub-opposite |
-
Sub-opposite refers to a condition where the leaves and buds are not
spaced sufficiently far apart to be considered alternate
nor are they perfectly opposite. They are in between
these two extremes. Examples would include Common
Buckthorn (Rhamnus
cathartica), Katsura Tree (Cercidiphyilum
japonicum), White Fringe Tree (Chionanthus
virginicus). |
|
|
subshrub |
- this is one of those
terms that is not very clearly defined. Generally when
it is used, it indicates a woody shrub that is quite small or
is one that is prostrate or hugs the ground. It might
also indicate a plant that may be considered a "perennial"
but is not strictly
herbaceous.
Example: Perennial candytuft (Iberis
sempervirens) is a low-growing plant commonly called a perennial in
the garden but it does maintain its foliage year around
in mild climates like an
evergreen shrub. |
subsoil |
- the layer of soil directly beneath the
topsoil which is
characterized by a lower proportion of
organic matter
and less fertility than the topsoil.
|
substance |
- in gardening terms, this is used to describe the
texture or thickness of the foliage of a plant. It may also pertain to the mass of the overall clump.
Hostas
with a thick or heavy substance tend to suffer less from
slug
damage. |
subtropical |
-
a zone of the earth which only rarely experiences
freezing temperatures. Areas of Southern Florida would
be considered sub-tropical.
See
temperate and tropical |
subulate |
- the shape of a leaf or bract when it tapers
from the base to the apex. |
sucker |
- an unwanted shoot, often vigorous, that sprouts from
the roots of a plant. These are common on certain
grafted trees such as
apples or crabapples. If the top
of the tree dies, do not expect a sucker to develop into
a good quality replacement. See
watersprout. |
sucking insect |
- an insect that damages plants by puncturing the
leaves or soft stems with its tube-like mouth and
feeding on the sap.
Aphids,
leaf hoppers and
scale are common sucking
insects. Spider mites also suck the juices from plants
but they have eight legs and are not an insect. |
|
|
sun scald |
- an injury to a plant from exposure to excessive sunlight
and heat. |
surfactant |
- a substance added to a spray that increases its
wetting and spreading properties (also called wetting
agents or spreader-stickers). |
symptom |
- when diagnosing a plant problem, we can look for signs
and symptoms. A symptom is a response by the plant to
the presence of an insect, disease or environmental
problem. For instance, the symptom, wilting, is the
plant's response to a lack of water which could be
caused by drought or by the presence of a fungus which
clogs up the xylem.
See Signs More about
Plant Disease Symptoms |
systemic |
- refers to something that moves through the vascular system
of a plant. This can be a disease such as one of the
wilt diseases or can pertain to
pesticides which are
either injected into the plant or absorbed by the root
system and spread throughout the plant internally. |
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