All bonsai trees and pot plants are dependent upon us for nutrients and water. Feeding your bonsai will keep it strong and vigorous and help prevent attack from pest and disease. Please feed with a recognised bonsai fertiliser such as Bonsai Direct Liquid Bonsai Fertiliser , other general plant foods can be too strong for the bonsai and may scorch the roots. If using a liquid bonsai feed I would recommend feeding indoor bonsai once a week during the spring, summer and autumn. Reduce the feeding to approximately once a month in mid-winter when it is barely growing. It is particularly important to feed flowering bonsai. Bonsai, like the Serissa for example, are very hungry trees and rely on you for their nutrients. You will notice yellowing of the leaves if the bonsai is deficient in nutrients.