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Half-hardy annual Ageratum Red Sea is a superb border-filler in summer, with bright red fluffy flowers that darken to a striking deep purple-red. Held on tall stems, theyre very popular with pollinators and ideal for cutting. Ageratum Red Sea flowers from mid-summer into early autumn, adding colour and life to sunny borders.
Sow indoors
Almost fill a seed tray with moist seed compost. Sow seeds thinly over the surface, and lightly cover them with a little more compost. Place in the warmth, 15-20C and keep moist.
Grow on
Keep seedlings in a light position, but shade from direct sunlight. When large enough to handle, transplant 5cm apart into trays of potting compost.
Harden off/plant out
Gradually accustom plants to outside conditions for 2-3 weeks before planting out when danger of frost has passed. Allow 25cm between plants.
Aftercare
Remove faded flowers during summer to prolong blooming.