UK pruning guide · RHS timing
When to prune begonia 'passing storm' in the UK
Why the timing differs here
For shrubs that flower on the current season's growth, the RHS times pruning to early or mid spring — after severe weather has passed and once the growth buds begin to swell. In Britain that is usually March into April rather than the February common in warmer regions; prune too early and the new shoots meet a late frost.
How to prune begonia 'passing storm'
Use clean scissors or fingers to remove dead or yellowing leaves at the petiole base. Pinch growing tips of any leggy stems back to a healthy leaf node to encourage bushiness.
Rex begonias like 'Passing Storm' need minimal pruning. Remove dead, damaged, or yellowing leaves at the base as they appear to keep the rosette tidy and improve airflow. Pinch back any leggy stems in spring to encourage a fuller, more compact shape. No heavy pruning is required or beneficial.
More begonia 'passing storm' care for British gardens
Care at a glance
- When to prune rex begonia in the UK — the species this cultivar belongs to
- General begonia 'passing storm' pruning guide
- RHS hardiness ratings explained
Pruning begonia 'passing storm' in the UK — FAQ
When should I prune begonia 'passing storm' in the UK?
Prune begonia 'passing storm' in early to mid spring. For shrubs that flower on the current season's growth, the RHS times pruning to early or mid spring — after severe weather has passed and once the growth buds begin to swell. In Britain that is usually March into April rather than the February common in warmer regions; prune too early and the new shoots meet a late frost.
Is it illegal to prune begonia 'passing storm' in spring or summer in the UK?
There is no nesting-bird restriction that realistically applies to begonia 'passing storm', since birds do not nest in it. The Wildlife and Countryside Act 1981 still protects any active nest you do find anywhere in the garden — the rule is about the nest, not the plant.
How do you prune begonia 'passing storm'?
Use clean scissors or fingers to remove dead or yellowing leaves at the petiole base. Pinch growing tips of any leggy stems back to a healthy leaf node to encourage bushiness.
How often does begonia 'passing storm' need pruning in a British garden?
As needed; light tidying every few weeks during active growth. Rex begonias like 'Passing Storm' need minimal pruning. Remove dead, damaged, or yellowing leaves at the base as they appear to keep the rosette tidy and improve airflow. Pinch back any leggy stems in spring to encourage a fuller, more compact shape. No heavy pruning is required or beneficial.
Why is UK pruning timing different from American advice?
Most pruning guides online are written for US conditions and anchored to USDA zones. Britain's maritime climate gives milder winters but later, less predictable last frosts — from March in the south-west to mid-May in the north — so the RHS advises against winter pruning for most plants: it pushes out soft growth that a late frost then kills. Britain also has the nesting-bird law, which has no US equivalent.