Indoor Gardening for Children
A good project for a child who has a sunny window is to grow a pot of morning-glories. If you don't know how this plant is look for, you can find it with PlantSpot plant identifier. A few seeds may be planted at any time in a 5 or 6 inch pot. After they have some growth, they should be thinned to leave the three strongest. Keep the soil moist, the pot in a sunny warm place, and the plants will begin to bloom when they are about three months old. After one season the plant should be discarded.
The spider plant, Chlorophytum elatum, has thick white tuberous roots, similar to a white icicle radish, and its rosette-forming grasslike foliage grows easily under all sorts of conditions. It propagates itself naturally by sending out slender branches, the end of each tipped by a young rosette. As this grows and attains weight it is lowered to the ground. If it finds moist soil, the new plant will form its own roots. Children like to help a young plant get started on its own by pinning it into a neighboring pot of moist soil. As soon as roots form, the plant may be severed from its parent.
Children find fun in starting an avocado seed in a glass of water. Insert three toothpicks at intervals around the seed so that the larger, lower third is in the water, but the rest is held above. After a root forms and top growth begins, transplant to regular potting soil. Avocados may be trained as small trees or bushes and kept inside the year round, or they can be put outdoors during warm weather, and brought indoors in the winter.
As your young gardener progresses, and his interest grows, he or she will find gardening full of unlimited possibilities. The plants and activities suggested here are a mere beginning. As additional reading and resource material, I suggest reading any of the plentiful books available, or visiting Gardening With Children.