Plant pentas after frost, when the soil is warm. Set the transplant at the same depth it grew in the pot.
Plant after frost, when the soil is warm
| Factor | Recommended | Avoid |
|---|---|---|
| When | After the last spring frost, once nights stay warm | Setting a tender plant into cold, wet soil |
| Set | Top of the root ball even with the surrounding soil | Burying the stems, or planting into a hole that holds water |
| Spacing | About 12 to 24 inches in a bed, according to the mature width on the tag. Mass plantings often sit 18 to 24 inches apart | A tight row that stays wet around the stems |
| Start | A sturdy nursery plant with white roots, not a circling, rootbound pot | Buying stock while nights are still freezing |
Wait until frost has passed and the ground has warmed. Pentas stalls in cold soil and looks static until real heat arrives, so an early set wastes weeks. [1] Butterfly Deep Pink and Sunstar Lavender take that same after-frost window. Sun, water, and deadheading stay on How to Grow Pentas.
When do I plant pentas?
After the last frost, once nights stay warm. Do not plant it in the same window you plant cool-season annuals.
How to plant pentas
Set one transplant at a time into a hole the size of the root ball, then water to settle.
- Choose a full-sun bed that drains. Dig down, fill with water, and confirm it clears within a few hours. Work compost into sand so the bed holds moisture without staying soggy.
- Water the nursery pot before you unpot it, so the root ball stays together. [2]
- Dig a hole as deep as the root ball and a little wider. Slide the plant out and tease circling roots.
- Set the top of the root ball even with the soil. Backfill and firm lightly. Do not bury the stems.
- Space plants about 12 to 24 inches apart, according to the mature width on the tag. For a mass planting, 18 to 24 inches is the usual range. [3] [4]
- Water thoroughly. After planting, keep-alive care is on How to Grow Pentas. A patio container is on Pentas in Pots.
How far apart do I plant pentas?
About 12 to 24 inches, matching the width on the tag. Mass plantings often sit 18 to 24 inches apart. Do not crowd them into a hole that stays wet.
If a new plant sits without growing, the soil is still cold. Wait for heat, then water it in.
FAQ
Should I pinch a new transplant?
You can pinch tips when the plant is four to six inches tall if you want a bushier start. That delays the first bloom by a couple of weeks. It is optional. Weekly deadheading on How to Grow Pentas matters more.
Related guides
Recommended plants
References
This note is part of Pentas Guides.
More planting notes by plant are gathered in Planting Guides.
Updated: Reviewed by Bosquelle Editors