Ananas Comosus, the familiar edible pineapple grows much too big as an indoor plant. There is a decorative indoor form which is Ananas Comosus Variegatus. It has spiny leaves that are green with ivory margins. When the plant is about 6 years old, it develops a flower followed by a small fruit atop a 3 feet tall stalk.
Allow compost to dry out between waterings. Water twice a week in Summer, once a week in Winter.
Apply standard liquid fertilizer every 2 weeks throughout the year.
The plant does not require very big pot, for it has relatively little root. A 6-8 inches pot should be the largest size needed. Wear gloves to protect hands from sharp leaves.
The best way to propagate this plant is by means of offsets. Use a sharp knife for detaching an offset from the base of its parent when it is between 4-6 inches long. Plant in a 3 inch pot containing equal parts of moistened peat and perlite or sand and enclose the whole in a plastic bag. The offset should root in about 8 weeks.
Give the plant plenty of sun and warmth. The sunnier the position, the stronger the colouring of those species that have variegated leaves. Keep compost moist all year round, never soggy, but never dry.
The top of shop-bought pineapples can also be rooted to form house-plants. Cut off the top of the fruit with just a little of the flesh and bed this into a pot of equal parts of peat and sand. Keep compost moist and place pot in a heated propagator.
To encourage flowering, place 2-3 ripe apples and cover the whole with a clear plastic bag. After a few days the ethylene gas given off by the apples, should stimulate the plant to flower. Remove the bag.
Ananas does best when it has high humidity. Spray overhead twice a week in Summer, more frequently if in hot dry room. Spray once a week in Winter. Stand pot on a tray of gravel or peat that is kept constantly moist.
Rich compost - loam-based #2.
Less than 2 percent of the insects in the world are harmful. Most are beneficial.