When to plant Sunflowers in Edinburgh

Sow seeds around 11th May - 1st June in small pots or modules, or direct where they are to flower in mild areas. Sow seeds to a depth of 2–3 cm and keep the compost just moist while they germinate.

From 11th May to 25th May, move seedlings outside for longer spells each day so they adjust to wind and sun. Keep them sheltered from hard frost and check the compost so the roots do not dry out.

Plant out from 18th May once the soil has warmed and the risk of frost has passed. Space plants 30–45 cm apart, water them in thoroughly, and use fleece or a cloche if cold nights are still forecast.

From 1st June to 27th July, fit a cane or stake beside tall plants before they become top-heavy. Tie stems loosely with soft twine and keep the base weed-free so the roots can spread.

From 3rd August to 16th October, deadhead branching varieties so they keep flowering. For single-stemmed sunflowers, cut the flower for indoor display or leave the head to ripen for seed. Water during dry spells.