Red leaf begonias are true summer survivors. They flourish in full sunlight and love humidity. They are a hybrid wax begonia with bright red foliage and pink to white flowers. The red leaf begonia is considered a perennial in U.S. Department of Agriculture plant hardiness zones 9 to 11. These fellows are right at home in beds and borders, and are suitable for containers. The red leaf begonias thrive in rich organic, well-drained soil and love plenty of fertilizer.
Plant young begonias outdoors when all danger of frost has passed. The ground where the bedding plants will go needs to be warm, and the air temperature should be at least 60 degrees Fahrenheit.
Prepare the soil by spreading 2 to 4 inches of peat-based compost or aged manure on top of the soil where you plan to locate the begonias. Work it into the soil at least 8 inches deep. More organic matter can be added if needed. This will improve fertility and increase water retention and drainage.
Dig a hole large enough for the begonia’s root ball to fit comfortably. The hole doesn't have to be too deep as the plant has shallow roots. Place the begonia in the hole and completely cover the root ball.
Space plants at least 12 inches apart. Red leaf begonias grow 6 to18 inches tall and 6 to 12 inches wide, so they need plenty of room.
Water the soil around the begonia right after planting. Red leaf begonias like to be kept moist, but not over-watered. If the soil feels dry, then the plant needs water.
Fertilize with a phosphorus fertilizer right after planting to encourage root growth. Red leaf begonias do well with once a month feedings.
Things You Will Need
- Shovel or trowel
- Peat-based compost or aged manure
- Bedding plants
- Phosphorus fertilizer
- Choose bedding plants, as begonias grown from cuttings or seeds are slow to establish.
- These begonias need a fertilizer with extra phosphorus for root development. Fertilizers that have added phosphorus will have the letter “P” on the bag. It will be the middle number.
- Once plants have reached full growth, pinch off tips for a bushier appearance.
- Keep an eye out for slugs and cutworms. These pests seem to favor red leaf begonias.
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