Angraecums should be kept evenly moist at all times of year as they don't have water storing bulbs. They should be watered at 7 to 10 day intervals and sprayed with clean water daily from late spring through early autumn and every 10 to 14 days at other times of year. They thrive on good humidity so whenever possible you should damp down the greenhouse staging and paths during the hottest months.
The plants are moderate feeders and a general purpose plant food can be applied from April to September at 1/4 the pack recommendation, feed these plants every third watering. Flush the pot or basket out once a month with clean water to remove any unused plant food and salts which can build up in the compost and harm the roots. During late August and September you should water with a higher potash feed (again at 1/4 strength and every third watering) which will encourage the new leaves to harden in readiness for the darker winter months. Feeding should cease by late October and no more should be given until the following late winter (Feb/Mar) at which time normal feeding can resume.
Re-potting schedule and Compost
Angraecum are naturally epiphytic and can be grown either in a pot, basket or mounted on to bark. If planted in pots then large open grade compost or bark with the addition of 1/4 sphagnum peat should be used to allow swift drainage whilst holding moisture, in this case you should re pot the plants every year or every other year depending on it's size, this should be undertaken in spring as growth re starts. If grown in baskets or on bark then re planting can be left for two to three years or until they become unmanageable before being re planted.