Use a high-quality potting mix enriched with organic matter:
Mix equal parts potting soil, compost, and peat moss or coconut coir for moisture retention.
Add slow-release fertilizer or mix in balanced (10-10-10) fertilizer according to package directions.
Avoid garden soil which can be too heavy and poorly draining in containers.
Step 4: Start Seeds or Buy Seedlings
Starting from Seeds:
Start seeds indoors 10-12 weeks before the last expected frost.
Sow seeds 1/8 inch deep in seed trays or small pots filled with seed-starting mix.
Keep moist and warm (65-75°F).
Germination takes 10-14 days.
Transplanting Seedlings:
When seedlings have 2-3 true leaves and are about 3-4 inches tall, transplant to your container.
Space celery plants 6-8 inches apart.
Alternatively, buy young celery seedlings for a head start.
Step 5: Planting in Containers
Fill your container with prepared potting mix, leaving 1-2 inches at the top.
Make holes spaced 6-8 inches apart for each plant.
Place seedlings gently in holes; firm soil around roots.
Water immediately to settle soil.
Step 6: Location and Light Requirements
