Type: Notion Reference Database Scope: Alocasia corms + 15 comparable aroid/bulb/tuber/rhizome propagation structures Use: Filter by medium, sort by rooting speed, compare rot risk before you plant
🌱 Key Takeaways
- Orientation rule: For true corms (Alocasia, Colocasia, Caladium), the pointed "eye" always faces up. Get this wrong and sprouting stalls or fails entirely.
- Fastest rooting medium: Perlite and water tie for speed (2–4 weeks), but perlite has lower rot risk.
- Best beginner medium: Water — full root visibility, easy to catch problems early.
- Best long-term medium: Soil or perlite — better nutrient access and structural stability than water.
- #1 failure cause across almost every structure type in this database: overwatering / poor drainage, not cold or low light.
- Universal fix for stalled sprouting: check orientation first, then firmness (soft = rot, discard), then temperature (most tropical structures need 70–85°F / 21–29°C).
| Plant / Structure | Structure Type | Best Medium | Rooting Time | Rot Risk | Orientation Sensitive? | Beginner Friendly? |
|---|---|---|---|---|---|---|
| Alocasia (corm) | True corm | Water or Perlite | 2–4 weeks | Moderate (water) / Low (perlite) | Yes — eye up | Yes |
| Colocasia / Taro (corm) | True corm | Soil | 3–5 weeks | Moderate | Yes — eye up | Yes |
| Caladium (tuber) | Tuber | Soil | 3–6 weeks | High if cold | Yes — eyes up | Moderate |
| Amorphophallus / Konjac (corm) | True corm | Soil | 4–8 weeks | High | Yes — eye up | Advanced |
| Zantedeschia / Calla Lily (rhizome) | Rhizome | Soil | 2–4 weeks | Moderate | Yes — eyes up | Moderate |
| Philodendron (stem cutting) | Stem cutting | Water or Moss | 2–4 weeks | Low | No | Yes |
| Monstera (stem cutting w/ node) | Stem cutting | Water or Sphagnum moss | 3–6 weeks | Low | No — node must be submerged/covered | Yes |
| Pothos (stem cutting) | Stem cutting | Water | 1–3 weeks | Very low | No | Yes |
| Anthurium (division) | Division | Soil | 2–3 weeks | Low | No | Yes |
| Dieffenbachia (cane cutting) | Cane cutting | Soil or Moss | 3–5 weeks | Moderate | No | Moderate |
| Sansevieria / Snake Plant (division) | Rhizome division | Soil | 1–2 weeks | Very low | No | Yes |
| Zamioculcas / ZZ Plant (rhizome) | Rhizome | Soil | 4–8 weeks | Low | No | Moderate |
| Begonia (rhizome cutting) | Rhizome | Soil or Moss | 3–6 weeks | Moderate-High | No | Moderate |
| Dahlia (tuber) | Tuber | Soil | 2–4 weeks | High if wet/cold | Yes — eye at crown | Moderate |
| Crocus (corm) | True corm | Soil (outdoor) | 6–10 weeks (seasonal) | Low | Yes — pointed tip up | Yes |
| Gladiolus (corm) | True corm | Soil (outdoor) | 6–8 weeks (seasonal) | Moderate | Yes — flat side down | Moderate |
Ratings compiled from grower-reported ranges; individual results vary with temperature, humidity, and corm/cutting health.
| Medium | Root Visibility | Rot Risk | Speed | Water Change Frequency | Best For | Transfer Needed? |
|---|---|---|---|---|---|---|
| Water | High | Moderate | Fast (2–4 wks) | Every 3–5 days | Beginners, observation | Yes, to soil once rooted |
| Soil | None (buried) | Low | Moderate | N/A — keep lightly moist | Long-term growth | No |
| Perlite | High | Low | Fast (2–4 wks) | N/A — keep moist, not wet | Rot-prone corms | Yes, to soil eventually |
| Sphagnum Moss | Moderate | Low–Moderate | Moderate | N/A — keep evenly damp | Humidity-loving varieties | Optional |
| Symptom | Likely Cause | Fix |
|---|---|---|
| No sprouting after 4+ weeks | Wrong orientation or non-viable corm | Check firmness; confirm eye faces up; discard if soft/moldy |
| Corm feels soft or mushy | Rot from overwatering/poor drainage | Remove affected tissue if caught early; switch to airier medium (perlite) |
| Mold on water surface | Stagnant water | Change water every 3–5 days; use clean container |
| Growth stalled after initial sprout | Low temperature or insufficient light | Move to 70–85°F (21–29°C) spot with bright indirect light |
| Roots forming but no leaf growth | Normal early stage | Continue current conditions 1–2 more weeks before troubleshooting |
| Corm shriveling before planting | Dehydration | Soak 12–24 hrs in lukewarm water before planting (skip if already soft/rotting) |
Q: Can I use the same rooting timeline across all corm-type plants? No — true corms range from 2 weeks (calla lily) to 8+ weeks (Amorphophallus). Always check the specific plant's row in Database 1.
Q: Is perlite always better than water? Not always — water offers better visibility for beginners diagnosing problems early; perlite offers lower rot risk for long-term rooting. Trade-off, not a strict upgrade.
Q: Do all "corms" need the eye facing up? Yes, for every true corm in this database. Divisions, cane cuttings, and stem cuttings (Pothos, Philodendron, Sansevieria) are not orientation-sensitive in the same way.
Q: My corm is peeled — is that a problem? Not necessarily. Peeling exposes rot/damage for inspection but isn't required for healthy corms; over-peeling increases dehydration risk.