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How Often To Water Begonias?
Water begonias about once a week, when the top inch of soil is dry, and keep water off the leaves. Learn how to avoid rot and powdery mildew.
Water begonias about once a week, when the top inch of soil feels dry, and pour at the base so the leaves stay dry. Pots in warm, bright rooms may need a drink every 4 to 5 days. Soggy soil rots the stems and tubers faster than any other problem.
A starting point, not a rule. Check the soil before each watering and stretch the gap in cool, cloudy weather.
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Begonias give you colorful flowers or patterned leaves for almost nothing. They are also fussy about water in a way that catches many owners off guard.
Their stems are soft and their roots are fine, so they rot in wet soil. Their leaves hold droplets, so they catch mildew when splashed. The best habit is simple: water the soil, not the plant, and only when it needs it.
Begonia watering schedule
| Situation | How often |
|---|---|
| Spring and summer indoors | About once a week |
| Hot, bright rooms | Every 4 to 5 days |
| Fall and winter | Every 10 to 14 days |
| Tuberous begonias in bloom | Every 3 to 4 days outdoors |
| Dormant tubers | Almost none |
The right moment is when the top inch of soil feels dry. Rex begonias like the soil slightly more even, while wax begonias handle a little drying between drinks.
How to tell when begonias need water
Push a finger 1 inch into the soil. If it feels dry, water. If it feels cool and damp, wait another day or two.
Begonia leaves also droop gently when the plant is thirsty. If the leaves are droopy and the soil is wet, the problem is rot, not thirst.
How to water begonias
- Water in the morning. Any drops on the leaves dry out during the day.
- Pour at the base. Use a small spouted can and aim at the soil under the leaves.
- Let it drain. Empty the saucer after about 10 minutes.
- Give it air. Space plants apart so air moves around the leaves.
Signs of overwatering and underwatering
Too much water
- Black or mushy stems
- Gray mold on leaves
- Yellow, dropping leaves
- White powder on the foliage
Too little water
- Wilting leaves
- Crispy brown edges
- Flower buds that drop
- Dry soil pulling from the pot
Why tuberous begonias need extra care
Tuberous begonias grow from a fleshy tuber that stores water. When it is wet and cold, it rots from the inside. Water the plants well while they are blooming, then ease off in fall as the stems yellow.
Once the leaves die back, stop watering and let the tuber rest dry over winter. In spring, water lightly again as the first shoots appear.
Plants that share your begonia shelf may like the same routine. See the guide on geraniums, or read about fixing overwatering if a plant is already struggling.
Begonias watering FAQ
How often should I water begonias?
About once a week, when the top inch of soil is dry. Water every 4 to 5 days in warm rooms and every 10 to 14 days in winter.
Should I mist begonias?
No. Wet leaves invite powdery mildew and gray mold. Water the soil and keep the foliage dry.
Why are my begonia leaves turning brown?
Dry soil and low humidity cause crispy edges. Soggy soil and rot cause soft, dark patches.
We turn horticulture research and real growing experience into plain-English watering schedules you can actually follow.