Pediocactus simpsonii
Mountain Ball Cactus · Simpson's Hedgehog Cactus · Simpson's Foot Cactus
About the plant
What it is and where it grows — not part of any germination protocol.
- Habit
- succulent subshrubPlants of the World Online
- Habit
- Perennial, ShrubPLANTS Database
- Flower
- White, pink, magenta, yellow, yellow-greenFlora of North America
- Native range
- Native to the lower 48 statesPLANTS Database
Toxicity is noted only where a source states it. No note here is not a finding of safety.
Sources: Plants of the World Online — Royal Botanic Gardens, Kew; PLANTS Database — USDA NRCS; Flora of North America — Flora of North America Editorial Committee.
Worth knowing
- Though its range runs 900 miles from Oregon and Montana to Arizona and New Mexico, it is uncommon, growing at high elevations and often hidden by grass and fallen leaves. Lady Bird Johnson Wildflower Center: Pediocactus simpsonii
This source reports two treatments. Both are shown.
Protocol 1
DerivedN. C. Deno, 1993Difficulty Moderate
Start around March 19, 2027 for a May 3 last frost.
Cold moist stratification
Temperature: 40°F 4°C
Germination happens during step 1, in 17 days.
67% germination in 17 days.
Protocol 2
DerivedN. C. Deno, 1993Difficulty High
Start around February 8, 2027 for a May 3 last frost.
Sow and cover
Temperature: 70°F 21°C
No stated waiting before sowing. Then 56 days to germinate.
10% germination in 56 days.
How each step is done, in Deno’s words, and what Verified and Derived mean.
Germination trials
Readers’ own records of sowing this species, published after review. Share your trial · All trials
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