Live Indoor Air Purifying Black rubberplant with Pot

Don't keep rubber plants constantly moist. Leaf drop can occur when the soil is too dry or kept too wet. Allow the top 2 inches of the soil or growing mix to dry out between waterings. When the plant isn't actively growing during fall and winter, reduce watering even further. If you have a saucer beneath your rubber tree's container, don't allow standing water to remain in the saucer. Empty it as soon as it has collected.

Indoors, give rubber tree bright, indirect light or dappled shade, and protect plants from direct afternoon sun. If kept in too dark a location, plants can drop leaves and become more susceptible to pests and disease. Outdoors, rubber trees tolerate sun, partial shade or shade, except in the hottest summer areas, where direct afternoon sun can scald the leaves.

When your rubber tree is actively growing, fertilize it once a month with a general purpose water-soluble fertilizer such as 24-8-16, and mix it half-strength. For indoor plants, this would be 1/4 teaspoon per 1 gallon of water. For outdoor plants, use 1 1/2 teaspoons of plant food per 1 gallon of water. Stop fertilizing plants in the fall and don't fertilize them during winter months