
Zinnia elegans
Half-hardy annual grown for bright summer flowers. In the UK, start it under cover or sow outside after frost risk has passed, then plant out in a sunny, sheltered spot with free-draining soil.
Step-by-step instructions for growing Zinnia
Sow seeds in modules around 4th April - 18th April, about deep in fine compost. Keep them warm and bright, and water lightly so the compost stays just moist.
Pot seedlings on once they have a few true leaves, from 25th April. Move them into small pots so the roots do not get cramped, and keep them growing on in good light.
Harden plants off over 15 days before planting out, from 25th April to 9th May. Put them outside during the day at first, then bring them in at night until they cope with cooler air and brighter sun.
Plant out from 23rd May into fertile, free-draining soil in full sun, spacing plants apart. Water in thoroughly straight away, then protect young plants from cold nights and slugs if needed.
Remove fading flowers regularly from 29th June through 30th September. Deadheading stops the plant setting seed and keeps it producing new blooms right through to the autumn frosts.
Tap a plant to see why it works (or doesn't) with Zinnia.
Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.
Popular varieties of Zinnia to consider
Large, fully double flowers on tall plants, good for cutting.
Compact, uniform plants with strong stems and clean flower heads.
Dwarf bedding type with a neat habit and a long flowering season.
Bushy, reliable garden zinnia with good disease tolerance and plenty of colour.