Troubleshooting
Spider Milkweed problems — and how to fix them
Spider Milkweed (Asclepias asperula) 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.
Root rot in clay or wet soils
The most common cause of plant loss in cultivation. The deep taproot is highly susceptible to rot in poorly drained or overwatered soils. There is no recovery once severe rot sets in. Prevention through site selection and minimal watering is essential.
Aphids (Aphis nerii)
Bright yellow-orange oleander aphids colonise stem tips. Treat with targeted insecticidal soap or a strong water jet; avoid systemic insecticides to protect Monarch caterpillars which feed on this species.
Transplant failure
The deep, brittle taproot means Spider Milkweed does not transplant well once established. Sow seed in situ or establish from small container-grown plants while young. Do not attempt to move mature specimens.
Prevent spider milkweed problems before they start
Most spider milkweed issues are care-mismatch, not bad luck. Dial in the basics:
Looking for spider milkweed in general rather than its problems? Read the full spider milkweed care guide — light, water, soil and feeding.
Spider Milkweed problems — FAQ
Why is my spider milkweed root rot in clay or wet soils?
The most common cause of plant loss in cultivation. The deep taproot is highly susceptible to rot in poorly drained or overwatered soils. There is no recovery once severe rot sets in. Prevention through site selection and minimal watering is essential.
Why is my spider milkweed aphids (aphis nerii)?
Bright yellow-orange oleander aphids colonise stem tips. Treat with targeted insecticidal soap or a strong water jet; avoid systemic insecticides to protect Monarch caterpillars which feed on this species.
Why is my spider milkweed transplant failure?
The deep, brittle taproot means Spider Milkweed does not transplant well once established. Sow seed in situ or establish from small container-grown plants while young. Do not attempt to move mature specimens.