How to propagate panicle hydrangea 'vanilla strawberry' in the UK

Late summer to mid-autumn, from this season’s growth once the base of the stem has firmed up while the tip is still soft. Take 10-15 cm (4-6 in), cutting just below a leaf node. The British calendar puts this window in late summer, when the light is already going. That is why the RHS says summer cuttings seldom need bottom heat but autumn ones root faster with it — the same cutting, two months apart, is a different job here.

50% free-draining peat-free potting compost to 50% sharp sand. RHS propagation guidance specifies peat-free media throughout, and most British retailers now stock peat-free as standard. The mix matters more than the brand: cuttings rot in anything that holds water, which is why the RHS ratios lean so heavily on sharp sand and grit.

Summer cuttings seldom need bottom heat. By autumn they root noticeably faster in a heated propagator, which is the difference a British September makes.

Quick for cuttings taken in summer; slower as the light goes.

Most propagation guides online are written for warmer, brighter conditions where a windowsill will root a cutting on its own. British gardening organises the year differently — softwood in spring, semi-ripe in late summer, hardwood over winter — and the RHS specifies bottom heat of 18-24°C (64-75°F) for softwood cuttings, which an average unheated British room does not reach. British winter light is the other constraint: the same cutting that roots in three weeks in June can sit for three months from a November windowsill.

The technique is usually the same — stem-tip cutting (with a node) or air layering. What changes here is when you do it, what you root it in, and whether you need heat. Our panicle hydrangea 'vanilla strawberry' propagation guide covers the general method; this page covers the British calendar and conditions.