Arisaema amurense-dark form seeds are in stock. What other better occasion to talk a bit about it? Truth is, I had this post half prepared since last year, so it came in handy.
Arisaema amurense is a cold hardy species with a large geographically distribution on the East coast of Asia: China North-Central, China Southeast, Inner Mongolia, Khabarovsk, Korea, Manchuria, Primorye and Sakhalin. (https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:85565-1)
Just like our native Jack in the pulpit, it comes in a wide range of forms regarding the height, spathe color and leaf size. 
Mature, flowering plants have leaves with 5 folioles and usually the flowers are green striped with white; seeds of this form were offered a few years ago.
The inside of the flowers can also be brownish green or purple green with white stripes. Usually they are held on short stalks below or among the foliage.
The mother-plant of this form was grown from ORG&HP seedex, and the seeds were donated under the name of A. triphyllum ssp. quinatum (which anyway is tender and can’t be grown in our zone 5-6 climate). Most probably that it still goes in various garden circles under the wrong name.
The seedlings first develop a leaf with only 3 folioles, sometimes even the 2 years old plants. A flowering size mature plant has the typical 5-foliolate leaf, which you can see in the picture below. It is quite different than A. triphyllum ssp. quinatum: the folioles are broadly ovate in shape and can be slightly serrated on the margins.
Arisaema amurense leaf. In our climate, Arisaema amurense is the first Arisaema species to emerge from the ground, even earlier than our native Jack in the pulpit. This is a very cold hardy species, so if you are looking to expand your Arisaema garden ‘repertoire’ do not be afraid to give it a try.
The fruits on my plant develop an orange color at maturity, as opposed with A. triphyllum which turns deep, shiny red but maybe it cannot be generalized. I have a plate showing the differences in fruit color: Arisaema triphyllum, Arisaema amurense and Arisaema flavum (another hardy species, easy to grow from seeds). The seeds are similar, size and shape wise.
Arisaema amurense is very easy to grow from seeds. The seeds germinate at room temperature, so it can be started indoors in early spring or outdoors in late spring.
10-15 seeds are quite perfect for sowing a 3-4 inch pot in which to leave the seedlings grow for at least 2 years before planting the 
tubers in the ground. Arisaema seedlings do not need pricking out, reason why always sow the seeds in a slightly larger pot in which to have room to grow for 2-3 years (or transfer the little tubers when dormant in a new pot).
As garden companions use various species that also enjoy a part-shaded location, in a rich garden soil: Saruma henryi, Hydrastis canadensis, Aristolochia, Glaucidium palmatum, Epimedium, Helleborus, Podophyllum, Hepatica, Brunnera….to mention just a few.
It might start forming a colony if it likes the place but sharing Arisaema tubers with other Arisaema enthusiasts is always fun to do!
