When to plant Rhododendron?

Rhododendrons thrive in partial to full shade, making them ideal for woodland gardens or north-facing borders where many other shrubs struggle. They require acidic soil with a pH between 4.5 and 6.0, so avoid planting in chalky or alkaline ground. If your soil is neutral or slightly alkaline, dig in generous amounts of ericaceous compost or peat substitute, or consider growing your rhododendron in a large container filled with ericaceous potting mix. Prepare the planting site by digging a hole twice as wide as the root ball but no deeper—rhododendrons have shallow, fibrous roots that sit close to the surface. Break up compacted soil at the base and sides of the hole to encourage drainage, as waterlogged roots will quickly rot. Mix plenty of organic matter such as leaf mould or composted bark into the excavated soil to improve structure and moisture retention. Plant in April, May, September or October when the soil is workable and temperatures are mild. Position the root ball so the top sits level with or very slightly above the surrounding soil—never bury the stem. Backfill with your amended soil, firming gently to eliminate air pockets. Space plants 240 cm apart to allow for their mature spread of up to 3 metres. Water thoroughly after planting, soaking the root zone completely. Apply a 5–8 cm layer of acidic mulch such as pine bark, composted conifer needles or leaf mould around the base, keeping it clear of the stem. This conserves moisture, suppresses weeds and gradually acidifies the soil as it breaks down. Avoid disturbing the soil around established plants, as their shallow roots are easily damaged.