When to plant Oriental poppy?

Oriental poppies (Papaver orientale) are best planted in March, April, September or October, when the soil is workable and temperatures are moderate. Choose a site in full sun for the strongest stems and most abundant flowers, though they will tolerate partial shade. The soil must drain freely—oriental poppies are prone to rot in waterlogged conditions. They thrive in loam, sandy soil or chalky soil, and are particularly happy on alkaline ground. Prepare the planting area by digging in plenty of grit or sharp sand if your soil is heavy clay, to improve drainage. Work in a handful of general-purpose fertiliser or well-rotted compost to give young plants a good start. Dig a hole slightly larger than the root ball, and plant so the crown sits at soil level—burying it too deeply encourages rot. Space plants 45 cm apart to allow for their mature spread of 40–60 cm and to ensure good air circulation, which helps prevent mildew. After planting, firm the soil gently around the roots and water in well to settle them. Apply a thin mulch of grit or gravel around the base of the plant, keeping it clear of the crown itself. This helps suppress weeds and keeps the neck of the plant dry. Avoid organic mulches like bark, which can hold too much moisture against the crown. Water regularly for the first few weeks until the plants are established, but do not overwater. Oriental poppies develop deep taproots and dislike disturbance once settled, so choose your planting spot carefully—they are best left in place for many years.