Description

Tuberous Begonias are deservedly treasured for their double or single large, delicate, glorious flowers in almost every colour of the rainbow except blue. They also come in many variations of frills and ruffles. Depending on variety, the flowers are produced from tubers which sprout in mid-spring and are carried on weak, brittle stems with rather sparse, mid-green leaves to a height of up to 60cm.

Cultivation

Tuberous begonias are best grown indoors or under cover outside in a standard potting mix with peat moss or leaf mulch added to increase acidity. To assist with good drainage and aid the roots to breathe, add some additional sand or perlite to the soil mixture. Grow them in bright to moderate light, with good ventilation and above average humidity. Space the tubers 5 to 10 cm apart in a suitable sized pot which not too oversized as begonias do best with a restricted root run. Plant them with the convex side up and level with the soil surface then cover them lightly.

When the plants are growing actively, supply a weekly feeding of diluted liquid organic fertilizer. When the shoots have reached 15cm tall, move the container to the final desired location in the garden or house. Once properly established, the plants should become almost but not quite dry and then receive a thorough soaking. Keep water off the crowns, especially if the weather is cool. Light is important; provide either morning or late afternoon sunlight, but never direct sun in the heat of the day. Do not be afraid to pinch out the first flower buds as this will encourage more and better flowers. Protect them from snails, slugs aphids, thrips and spider mites.