How to prick out seedlings
Pricking out is the process of moving young seedlings from a crowded tray into individual pots or more spaced positions. It gives each plant room to grow, stronger roots, and better access to light and nutrients.
Done at the right time, it prevents weak, leggy plants and improves overall success.
Quick answer: how to prick out seedlings
Prick out seedlings once they have developed their first true leaves. Gently lift them, handle by the leaves (not the stem), and replant into individual pots with fresh compost.
Time of year
- Typically done early to mid spring, depending on when seeds were sown
- Happens 2–4 weeks after germination for most plants
- Only done once seedlings are large enough to handle
5 step guide to pricking out seedlings
Step 1: Wait for the right stage
- Seedlings should have 2–3 true leaves
- Avoid moving them too early
- Roots should be just developed
Step 2: Prepare new containers
- Use small pots or modules
- Fill with fresh, light compost
- Water lightly before transplanting
Step 3: Lift seedlings carefully
- Use a dibber, pencil, or spoon
- Handle by the leaves, not the stem
- Keep roots intact as much as possible
Step 4: Replant at the correct depth
- Make a hole and place seedling in
- Firm gently around roots
- Some plants (like tomatoes) can be planted deeper
Step 5: Water and settle
- Water lightly after transplanting
- Keep in bright, indirect light
- Avoid direct sun for the first few days
Best varieties & why (for pricking out)
- Tomatoes
- Respond well and can be planted deeper
- Lettuce and brassicas
- Benefit from spacing early
- Flowers like cosmos and zinnias
- Fast growers that need room quickly
Most seedlings benefit, but especially fast-growing ones.
Common issues, pests & diseases
Seedlings wilting after pricking out
- Cause: root disturbance or shock
- Fix: keep conditions stable and shaded initially
Leggy seedlings
- Cause: lack of light before transplanting
- Fix: move to brighter conditions
- See: https://www.theonlinegardencenter.com/how-to-garden/why-are-my-seedlings-leggy
Damping off
- Cause: poor airflow or overwatering
- Fix: improve ventilation and watering
- See: https://www.theonlinegardencenter.com/how-to-garden/how-to-prevent-damping-off-in-seedlings
Root damage
- Cause: rough handling
- Fix: handle gently and minimise disturbance
Best fertiliser, soil, lighting & growing conditions
- Light
- Bright light after transplanting
- Soil
- Fresh, nutrient-rich but well-draining compost
- Water
- Light watering initially, then consistent moisture
- Feeding
- Start light feeding once plants establish
Good conditions help seedlings recover quickly and grow stronger.
Climate and regional notes
UK & Ireland
- Often done indoors due to early season conditions
- Light levels are important after transplanting
Europe
- Northern regions similar to UK
- Southern regions may prick out earlier
USA
- Timing depends on sowing schedule
- Often done indoors before transplanting outside
Pro tips for better results
- Work quickly to prevent roots drying out
- Label seedlings clearly
- Only prick out healthy seedlings
- Avoid overcrowding in new containers
- Harden off before planting outside
10 frequently asked questions about pricking out seedlings
What does pricking out mean
It means transplanting seedlings into their own space.
When should I prick out seedlings
When they have their first true leaves.
Why not move seedlings earlier
They are too delicate and may not survive.
How do I handle seedlings safely
Always hold by the leaves, not the stem.
Can all seedlings be pricked out
Most can, but some (like root crops) prefer direct sowing.
What compost should I use
Fresh, light, well-draining compost.
Should I water after pricking out
Yes, lightly to settle the roots.
Why are my seedlings wilting after transplanting
Transplant shock — they usually recover.
Do I need to fertilise straight away
No, wait until they are established.
How long before planting outside
Once they are strong and hardened off.
