Begonia Maculata

Light

This begonia does best in partial sunlight. Indirect sunlight is best indoors, near a window. You may want to relocate it occasionally as the sunlight moves around according to the seasons, especially in winter as daylight hours grow shorter.

Soil

The polka dot begonia prefers a moist, rich soil. Since it is most often grown in containers or indoors, a good potting mix should suffice, or a sandy loam soil. Be sure there is adequate drainage; this can be improved by adding some perlite.

Water

It's very important not to overwater your begonia. Let soil dry out to about a half inch on the surface before watering. Overwatering can cause root rot which can eventually kill the plant. Watering no more than twice a week should be sufficient but this varies depending on humidity levels in your home also; you can gauge the right amount by checking the soil before watering.

Temperature and Humidity

This plant is rather fussy about its ideal temperature. Being a tropical, its perfect growing conditions should emulate its native areas. Temperatures between 65 and 70 are best. Temperatures below 60 degrees Fahrenheit can cause the plant to wilt. Begonia maculata needs a steady level of humidity, but not too much (45 to 50%), so using a humidifier is advisable if your home tends to have dry air. Placing it in or near the bathroom or kitchen will help increase the humidity levels. Placing saucers of water near the plant can help keep humidity consistent also. However, too much humidity can cause problems such as mildew or fungal rot, so monitor your begonia for any issues.

Fertilizer

A fertilizer can be used to help liven up the blooms on your polka dot begonia. A basic slow-release liquid fertilizer in a 10-10-10 formula should work fine; use this in spring and apply once every 2 to 3 weeks to increase blooms as needed.