Light.—Sunlight is power; it supplies the energy for carrying on food-making processes in the leaves of plants. Ordinary electric light is helpful on dull days, and it is possible to grow healthy plants entirely by fluorescent lighting. The needs of plants vary from full sunlight in a southern exposure, through half shade, to the steady, cool light of a northern window.
Different plants require a different water depth but you can easily adjust this by placing the pots on bricks or stones.
Keep tight control over the number of plants! A pool will only I hold so much and keep in a healthy state. A 6 by 6-foot pool hasi surface area of 36 square feet and will hold three or four small medium waterlilies and one or two other water plants, plus those I will grow about the outer edge of the pool.
For healthy plants and prolific flowering, make sure your containers get the very best start and use the right type of compost. Keep this well-watered and regularly cut off the dead flowers and weed the containers. Summer-flowering plants will need feeding regularly.