This green leaf sport of H. 'Sum and Substance' was registered by Walters Gardens, Inc. of Michigan in 1997. It forms a large size mound of medium green colored foliage and has lavender flowers in later summer.

According to The Hostapedia by Mark Zilis (2009), "The foliage on 'Green Gables' is a lighter green than that of 'Vim and Vigor', another Walters Gardens green-leaved sport of 'Sum and Substance'."