When to plant Smooth Hydrangea?

Smooth hydrangea 'Annabelle' thrives in partial shade or full sun, though in hotter spots some afternoon shade helps prevent the large white blooms from scorching. Choose a sheltered position if possible, as the heavy flower heads can be damaged by strong winds. The soil should be moisture-retentive loam or clay; this hydrangea dislikes dry conditions, so avoid free-draining sandy soils unless you're prepared to water frequently. Plant in March, April, September, or October when the soil is workable and not waterlogged. Dig a hole twice the width of the root ball and roughly the same depth. Break up any compacted soil at the base and incorporate a generous amount of well-rotted compost or manure to improve moisture retention. Position the plant so the top of the root ball sits level with the surrounding soil—planting too deep can lead to stem rot. Space plants 120 cm apart if you're creating a hedge or group planting; 'Annabelle' will reach 100–150 cm in both height and spread, so give it room to develop its natural rounded shape. After planting, backfill with the excavated soil mixed with compost, firm gently with your heel to eliminate air pockets, then water thoroughly. Apply a 5–8 cm layer of organic mulch such as composted bark or leaf mould around the base, keeping it a few centimetres clear of the stems. This mulch conserves moisture and suppresses weeds. Water again if the weather is dry over the following fortnight to help establishment.