Growing Orchids: Watering and Feeding Orchids
Don’t water orchids with very cold or limy (hard) water. Preferably keep a tank of rainwater inside the greenhouse, where it will remain tepid. Don’t use rainwater from an outside water butt; it can contain smallspores. When rainwater is not available, use tap water. But if your tap-water is limy, first boil it and let it cool.
To water hanging plants, take them down and immerse them in a bowl of water until bubbles stop rising from the compost.
After orchids have been in the same compost for over a year, feed them with a liquid fertilizer about once a fortnight during the growing season — late spring to late summer Water the plants first, as fertilizer can damage dry roots.