When to plant Bigroot geranium?

Geranium macrorrhizum thrives in partial or full shade, making it an excellent choice for the trickier spots under trees or along north-facing borders. It tolerates a wide range of soils—sandy, loam, or chalky—provided drainage is reasonable. Before planting, clear the area of perennial weeds and dig in a little garden compost or well-rotted manure to improve soil structure, though this geranium is not fussy and will manage in poorer ground. Plant in March, April or May for spring planting, or in September and October for autumn planting. Autumn planting allows the roots to establish over winter, but spring planting works perfectly well if the soil is workable and not waterlogged. Space plants 40 cm apart; they spread steadily by rhizomes and will knit together into weed-suppressing ground cover within a couple of seasons. Dig a planting hole slightly wider than the root ball and set the plant so the crown sits at soil level—don't bury it. Firm the soil gently around the roots to eliminate air pockets, then water in thoroughly even though this species has low water needs once established. A light mulch of leaf mould or composted bark around (but not over) the crown helps retain moisture and suppress weeds while the plants settle in. Geranium macrorrhizum establishes quickly and needs little fuss; just keep an eye on watering during the first few weeks if conditions are dry, especially for spring plantings.