The most common reason houseplants are losing their flowers is too little sunlight. When the plants can’t get enough light to produce healthy flowers, they may start toDroop or lose their leaves. Make sure your plant is getting the sunlight it needs by positioning it in an area with plenty of direct sunlight. Also, keep in mind that a plant's natural defenses against pests and diseases will usually help prevent flower loss. If you notice any signs of infestation, treat the plant as soon as possible.