Species · genus Mammillaria · Cactaceae
Twin-spine Cactus
Mammillaria geminispina Haw.
Also known as: Whitey
Cultivars of M. geminispina
The named forms growers keep — each with its own page, each honest about how much we know.
No named cultivars catalogued under M. geminispina yet. When growers document a stable, named form, it earns its own page here.
Guide
The species-level account. Cultivar pages build on this and say where they differ.
A clustering succulent cactus from arid regions of northeastern and Gulf Mexico, storing water in its spined, globular stems. It wants gritty, fast-draining mineral mix and plenty of bright direct light. Water deeply only when the mix has dried out completely, and let it stay dry through cooler, darker months to avoid rot.
Care recipe
The species record — the baseline every cultivar inherits unless it says otherwise.
Care notes are early — not yet verified
- Light
- ai:claude-opus-4-8
- Water
- ai:claude-opus-4-8 (range 14-28d)
- Humidity
- ai:claude-opus-4-8
- Soil
- ai:claude-fable-5
- Care
- ai:claude-fable-5
Direct sun
≈ every 28 days
Low — average room
7–32 °C
Gritty, fast-draining cactus mix
Offsets separated and rooted after callusing
Dilute low-nitrogen cactus feed in spring and summer
Slow
Deep pink flowers ringing the crown in spring
Not yet documented
This is where toxicity lives — every cultivar of this species inherits it and none can override it.
Reference images
Every image credited. Licenses link to their deeds.
No reference gallery yet
A few clear photos — habit, a mature leaf, a flower if it blooms — would give this page its eyes.
Add imagesSources: ai:claude-opus-4-8 · ai:claude-opus-4-8 (range 14-28d) · ai:claude-fable-5
Kept true by its growers
Every fact here carries its source. Grow Twin-spine Cactus yourself? What you’ve observed — how it drinks, how it holds its color, a name that’s off — is exactly what keeps this page honest. Contributions are reviewed before anything changes.
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