Sow polka-dot plant seed on the surface of moist mix, and keep it warm and moist until it sprouts. Do not cover the seed. Start 8 to 10 weeks before frost if the seedlings are going outside.
Sow the seed on the surface and keep it warm and moist
| Factor | Recommended | Avoid |
|---|---|---|
| Sow | Press the seed onto moist mix; do not cover it, because it needs light | Do not bury the seed under a layer of mix |
| Warmth | Keep the mix around 68°F until it sprouts | Do not set the tray on a cold sill |
| Moisture | Keep the surface evenly moist until seedlings show, often in about four days | Do not let the tray dry out, and do not flood it |
| Move on | Transplant when seedlings have four true leaves | Do not leave crowded seedlings in the tray until they stretch |
Seed is a real start for polka-dot plant, though a stem cutting is faster if you already have a plant. The first seed leaves are green; the first true leaves show the spots. [1] Press the seed onto moist mix and do not cover it. Light helps it germinate. Keep the tray around 68°F and evenly moist. Seedlings often show in about four days. [2] When they have four true leaves, move them into small pots — three seedlings in a 3-inch pot, or five in a 4-inch pot — in a mix high in organic matter that still drains. [3]
- Fill a tray or small pots with moist mix that drains, and firm the surface.
- Press the seed onto the surface. Do not cover it.
- Keep it around 68°F and evenly moist until seedlings show.
- Transplant when they have four true leaves, and keep the mix barely moist while they settle.
Do I cover polka-dot plant seed?
No. Press it onto moist mix and leave it uncovered, because it needs light to germinate.
Start it 8 to 10 weeks before frost if you want it outdoors
Sow anytime if the plants will live indoors. If they are going into the garden, start 8 to 10 weeks before your last frost date, then hold them until nights stay above about 50°F. The outdoor plant-out itself is on How to Grow Polka Dot Plant Outdoors. [4] Spotting on seed-grown plants can vary from the parent, so take a cutting if you need an exact copy of a named leaf — that job is on How to Propagate Polka Dot Plant.
- Count back 8 to 10 weeks from your last frost date if the seedlings are going outside.
- Sow on the surface, keep the tray warm and moist, and grow them on in small pots.
- Harden them in bright shade after nights stay above about 50°F, then plant them out.
Will seed match the parent plant?
Not always. Spotting on seed-grown plants can vary. Take a stem cutting if you need the same leaf.
Press the seed onto moist mix, keep it warm, and transplant at four true leaves. Take a cutting if you need the same spots.
FAQ
How fast does the seed sprout?
Often in about four days at around 68°F, if the surface stays moist and the seed is not buried.
Is a cutting easier than seed?
Yes, if you already have a plant. Seed is the start when you have a packet and no stock plant.
Related guides
Recommended plants
References
- [1] Wisconsin Horticulture -
https://hort.extension.wisc.edu/articles/polka-dot-plant-hypoestes-phyllostachya/ - [2] Royal Horticultural Society -
https://www.rhs.org.uk/plants/hypoestes/how-to-grow-hypoestes - [3] NC State Extension -
https://plants.ces.ncsu.edu/plants/hypoestes-phyllostachya/ - [4] Almanac -
https://www.almanac.com/plant/polka-dot-plant
This note is part of Hypoestes Guides.
More notes on making another plant live in Propagating Guides.
Updated: Reviewed by Bosquelle Editors