Jeffersonia diphylla is uncommon both in the wild and in gardens. It starts early in spring with purplish new growth that opens white flowers long before leaves show on deciduous trees. Unfortunately the flowers only last a few days. Its real beauty comes next as the blue-green leaves develop. The shape of these is very unusual and look as if someone has pasted two leaves together, hence the name diphylla.

This is a very typical shade plant, that grows quick in spring to gather some sun light, and then enjoys a shady, cool summer under deciduous trees. It prefers a moist location, but I grow it in a dry area, that gets full noon day sun, and it seems to enjoy the spot. If it gets too dry it will go underground in late summer, but my plant seems to keep its leaves all summer long.

Common names include, twinleaf, helmet pod and ground squirrel pea. The name twinleaf obviously refers to the leaves. Helmet pod is a good description of the seed pod, which sticks straight up, but is shorter than the leaves. As it dries and releases the seeds, it curves over and starts looking more like a pipe.

There are two species in the genus Jeffersonia, the other being J. dubia, with light lavender blooms.

The following is a video describing the use of organza bags for collecting seed.


Jeffersonia seeds are hydrophilic and the embryo will die if seed dries out. Sowing the seeds before any drying takes place is the best approach. However, if they are to be stored for a while, it is best to let the seeds dry a bit and then seal them in a plastic bag along with slightly moist vermiculite.
Jeffersonia diphylla
(Jefferson-ee-a dy-FIL-uh)
Life Cycle: perennial
Height: 45cm (18in)
Bloom Time: early spring
Natural Range: Eastern North America
Habitat: damp woodlands
Synonyms: none
Cultivation of Jeffersonia diphylla:
Light: part to full deciduous shade
Soil: rich organic soil, limestone
Water: moist to medium
USDA Hardiness Zone: (4?) 5 – 8
Propagation: seed, division