WHEN TO SET OUTSIDE
After frost, when nighttime temperatures remain above 55°F.
PLACEMENT & CULTIVATION
Begonia effortlessly lights up shady areas with lush leaves and masses of flowers, lovely as a summer container plant or edging beds. However, it must have good drainage to thrive. If transplanting fibrous begonias into pots, plant slightly deeper to encourage the growth of new roots and stems. Bring inside for the winter when nighttime temperatures drop below 50°F.
Allow the soil to dry 1" down in small pots, 2" down from surface of larger pots before watering throughly. Avoid overwatering, which can cause root rots. Water early mornings if placed in sunnier areas to avoid leaf scorch.
Acidic to neutral (6.0-7.0).
Top dress in spring with a slow-release organic all-purpose fertilizer and again in midsummer.
Diseases & Pests:
Slugs may be interested in eating begonias—if they show up, sprinkle some iron phosphate slug bait pellets on the soil around the plant. Diatomaceous earth can also be used.