How to Grow Begonia
Annual
Bedding begonias are tender annuals valued for dependable colour in shade, part shade and gentler sun. Their glossy leaves and neat flowers cope well with the changeable British summer. Fibrous-rooted bedding begonias are common for beds and pots, while tuberous begonias offer larger, showier blooms for sheltered containers.
Planting
Start tuberous begonias under cover from February to April, or buy established plants in spring. Plant bedding begonias outside after the last spring frost, usually from late May, spacing 20 to 30 cm apart. Harden off plants gradually, especially if they have been grown in a warm greenhouse. Choose a sheltered site with well-drained but moisture-retentive soil or quality container compost. In Scotland and colder northern districts, wait for settled mild weather.
Care
Water regularly in dry weather, directing water at the compost or soil rather than soaking flowers. Allow the surface to dry slightly between waterings but never let containers dry out completely. Deadhead where practical, although many modern bedding begonias shed old flowers neatly. Protect plants from slugs and from cold, wet conditions. Feed container plants modestly during active growth according to fertiliser label guidance.
Bloom time
Bedding begonias generally flower from June until the first frosts, sometimes into October in sheltered southern gardens. Tuberous begonias can bloom from July onwards, with their display ending when autumn temperatures fall.
Garden uses
Begonias are excellent for shady doorways, containers, window boxes and reliable summer bedding. Their rounded forms soften formal edging and look effective planted in groups. Tuberous types provide a focal point in a sheltered pot, while fibrous-rooted plants give consistent colour where many sun-loving annuals struggle.
Tips
Avoid planting begonias in a cold, exposed bed. Choose varieties suited to your light level, as some bronze-leaved bedding types tolerate more sun than green-leaved selections. Lift tuberous begonias before frost if you wish to keep their tubers for next year; compost bedding plants after frost damage.
Growing Begonia: frequently asked questions
How do I grow begonia in the UK?
Start tuberous begonias under cover from February to April, or buy established plants in spring.
When does begonia flower?
Bedding begonias generally flower from June until the first frosts, sometimes into October in sheltered southern gardens.
How do I care for begonia?
Water regularly in dry weather, directing water at the compost or soil rather than soaking flowers.
General guidance for UK gardens. Timing and hardiness vary by region and season; the RHS or a local garden centre can advise for your area. Page updated 18 Sep 2026.