Wait until there’s no danger of a late frost before you plant the begonia outdoors, since they are sensitive to extreme temperatures. [2] X Research source You can find the expected last frost date by checking the Farmer’s Almanac or your local weather station. While your begonias are growing indoors, make sure to protect them from drafts. Begonias can also be grown from a cutting or a leaf.
If your begonias get too much shade, they’ll still grow well, but they’ll produce more leaves than flowers.
To test the drainage of your garden soil, dig a hole that’s 12–18 inches (30–46 cm) deep and equally wide. Fill it with water and wait for it to drain. Ideally, it should take between 10 minutes and 1 hour for the water to drain completely. [5] X Research source
Begonias grown in containers need to be fertilized more frequently. Fertilize them every 2 weeks or as often as recommended in the instructions on your fertilizer. Don’t spray the fertilizer directly on the plant, or it could burn the leaves and flowers. You can also provide nutrients by adding compost or peat moss to your begonias’ soil.
You can also encourage blooming and healthy, bushy growth by pinching off the new tips of any branches you’ve recently pruned. [8] X Research source
If you’re growing your begonias in containers, check the label on your potting mix to find out if it already contains fertilizer, and if so, what kind.
Store the tubers in a cool, dry, temperature-controlled area, such as a finished basement or pantry. When you’re ready to start the plants again in late winter or early spring, put the tubers in some damp peat moss and keep them in a warm area. Plant them in pots once you see roots and shoots appearing. Wait on moving the tubers back outside until the last frost has passed.
Begonias like humidity, so the soil should never be allowed to dry out completely. Insert your finger into the soil 2–3 inches (5. 1–7. 6 cm) deep to make sure it’s still moist below the surface.
Always read the precautions and instructions on any pesticide before using or storing it. Even natural products may be toxic to humans or pets if you use them incorrectly.
