Both over- and under-watering your ficus can cause leaf drop, so aim to keep the soil moist but not soggy. In general, the ficus requires more water during times of the year when it is receiving more light, and less water during the winter. Wiping its leaves of dust keeps the ficus looking its best and also allows it to take in the maximum amount of sunlight. Fertilize ficus during its active growing season, but forego feeding throughout the winter. During the summer months, ficus benefit from being placed outdoors in a shady spot. Just be sure to bring it indoors before nights begin to get too cold.
PotsFicus trees grow rapidly and can quickly become potbound, so it’s a good idea to check the plant’s root system periodically. The root system can become so dense that water goes right through without penetrating the roots, in which case you will want to replant it in a slightly larger container. Once a ficus is in a very large pot, it can become impractical to repot. When you weeping fig reaches this stage, you can keep it healthy by top-dressing it annually in the spring or early summer. Scrape off as much of the old potting soil as you can, replacing it with fresh. I keep the soil surface of my large ficus covered with sphagnum moss, which serves to discourage my cats from jumping into it.
PruningMature plants are best pruned and shaped to control for growth in the spring. The ficus will quickly respond to pruning with new growth. Be sure to protect carpeting and clothing when you are pruning a ficus, because it releases a sticky white sap from cut branches. The weeping fig naturally assumes a vase shape, so it’s best to give the plant its head while keeping it in bounds. Remove weak and dead branches first, then any branches that cross another branch. Removing some of the inner branches will open up the canopy and allow more light in. Always prune branches back to their juncture with other branches.
Ficus As An Air CleanerDid you know that your ficus is not just a beautiful houseplant, but an air purifier? A NASA research study included the weeping fig as one of 15 popular indoor plants which were discovered to be especially useful for removing the air of noxious household chemicals. Gases such as benzene, formaldehyde and trichloroethylene are released from household items like synthetic carpeting, fabrics and laminated counters. Through their everyday process of photosynthesis, houseplants absorb these indoor pollutants and render them harmless.
For more information about the many different ficus varieties and uses as a bonsai specimen, see Geoff Stein’s excellent articles
The Weeping Fig, Ficus Benjamina- Indoor and Out and
Introduction To Ornamental Figs in Cultivation.