Problems of Geraniums Indoors

Overwatering

• Overwatering a geranium can kill the plant. Geraniums flourish when the potting mix dries out slightly between waterings. Ensure that the pot has a drainage hole, and water when the soil feels dry. Check the soil to a depth of 4 to 6 inches to determine when the plant needs moisture. If you have any doubts concerning whether to add moisture, avoid giving the plant water. Geraniums accept dry soil better than overly moist soil.

Not Enough Light

• Indoor geraniums must have full sun to thrive. A lack of sunlight can lead to flowering difficulties. Keep plants in a sunny location, preferably by a window that faces south or west. If your area does not get sufficient light during the winter, you can use artificial light to keep the plant flourishing. Fluorescent lighting placed about 12 inches from the geranium should prove sufficient.

Improper Fertilization

• Indoor geraniums might suffer if you use too much fertilizer. If you have chosen a good potting soil for your plants, frequent fertilization should not be necessary. Avoid adding any fertilizer during the first two or three months after you put the plant in its container. Fertilize every other month after that, but only during the growing season. Use a 20-20-20 water-soluble fertilizer and follow label directions.

Diseases and Conditions

• Too much moisture and a lack of light can result in oedema, a condition in which blisters or warts begin to appear on the leaves. The blisters, about 1/16 inch wide, often occur on the bottom of the leaves, but might affect the stems also. Botrytis blossom blight, a disease caused by a fungus, affects the geranium's flowers, causing them to wilt. Making sure the plant has good air circulation and removing any wilted blossoms helps to alleviate this condition.