When plants are perhaps 4-8 inches (10cm - 20cm) tall pinch out the lead stem to encourage the plant to bush out. You may consider doing this more than once. Watch out for slugs and either control them using a proprietary brand of pellets or whatever other method you prefer. See the pinching out method below.
As the plant grows tie it into the stake you have set up already or if not carefully put one in place. Dwarf varieties should not need additional support.
Keep plants moist throughout and feed about once every three weeks with something like a tomato feed, Miraclegrow or a similar plant food.
Once buds appear increase this to weekly feeding.
Regularly check for mildew or other fungal diseases in warm damp weather.
Dead head regularly to ensure flowering throughout the summer and autumn.
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