Troubleshooting
Jack-in-the-Pulpit problems — and how to fix them
Jack-in-the-Pulpit (Arisaema triphyllum) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Tempting red berries
The showy autumn berry cluster is highly toxic and attractive to children and pets. Remove or fence off the berries in family or pet gardens.
Drying out in summer
Soil that dries between waterings forces early dormancy and a smaller plant the next year. Keep the root zone moist and mulched through the growing season.
Slow to establish and bloom
Seed-grown plants take several years to reach flowering size, and corms need maturity before producing the spathe. Patience and steady woodland conditions are required.
Corm rot in waterlogged sites
Although moisture-loving, the corm rots in standing water or heavy winter-wet soil. Provide humus-rich soil that stays moist but drains, not boggy.
Prevent jack-in-the-pulpit problems before they start
Most jack-in-the-pulpit issues are care-mismatch, not bad luck. Dial in the basics:
Looking for jack-in-the-pulpit in general rather than its problems? Read the full jack-in-the-pulpit care guide — light, water, soil and feeding.
Jack-in-the-Pulpit problems — FAQ
Why is my jack-in-the-pulpit tempting red berries?
The showy autumn berry cluster is highly toxic and attractive to children and pets. Remove or fence off the berries in family or pet gardens.
Why is my jack-in-the-pulpit drying out in summer?
Soil that dries between waterings forces early dormancy and a smaller plant the next year. Keep the root zone moist and mulched through the growing season.
Why is my jack-in-the-pulpit slow to establish and bloom?
Seed-grown plants take several years to reach flowering size, and corms need maturity before producing the spathe. Patience and steady woodland conditions are required.
Why is my jack-in-the-pulpit corm rot in waterlogged sites?
Although moisture-loving, the corm rots in standing water or heavy winter-wet soil. Provide humus-rich soil that stays moist but drains, not boggy.