When grown in an area Jack-in-the-pulpit likes it will spread naturally. The tubers form off sets that grow into new plants the following spring. The seed also germinates reliably. Take the ripened red seed in the late fall and squish the seed out of the pulp into the soil where you would like the plant to "spread".

Do jack-in-the-pulpit multiply?

How Does Jack-in-the-Pulpit Reproduce? As mentioned, jack-in-the-pulpit (Arisaema triphyllum) reproduces both vegetatively and sexually. During vegetative propagation cormlets, lateral buds, rise from the parent corm to form new plants.

Are jack-in-the-pulpit rare?

Jack-in-the-Pulpit, or what I refer to as Jack, is actually a native perennial herb found in dry and moist woods, swamps and marshes in Eastern North America, from Canada down to Florida and west to Texas, Oklahoma, Kansas and north to Minnesota and Manitoba. ... These 2 species are rare and grow in North America.