Correct watering technique is a vital aspect of greenhouse gardening. With its enclosed environment, a greenhouse ecosystem must be closely monitored to ensure healthy plant growth. The most common problem associated with greenhouse watering is increased humidity. Excess water spraying on tables or spilling on floors stays trapped in the greenhouse. As it evaporates, it increases humidity in the greenhouse, which can lead to the growth of fungi and the development of plant disease.
Water your plants with a gentle stream of water to avoid splashing. If one plant is infected with a fungal infection or other disease, it is easily spread by water splashing off the plant's foliage or soil surface.
Water plant containers until water just begins to drip out of the drainage holes in the bottom of the container, then stop. Avoid creating water puddles on the floor through excess watering. If a significant amount of water has collected after watering your plants, mop it up to avoid increasing the humidity level in the greenhouse.
Use a misting attachment on your hose to water young seedlings, as they are so delicate.
Check moisture levels in the various soils daily by inserting a finger. Keep germinating seeds and seedlings constantly moist with regular watering. Only water adult plants when the top 1/3 of their containers dry out. Over-watering can lead to root rot.
Water early in the morning so the plant's tissue dries by evening.