When to plant Showy geranium?
Best month and method — Geranium × magnificum
Plant your showy geranium in March, April, September and October — the optimal month is usually September.
The next planting window is September.

Spacing
50 cm
≈ 4 plants
For an X m² border, calculate: X × 4 plants.
Step by step: plant showy geranium
Geranium × magnificum thrives in full sun or partial shade, making it a versatile choice for borders, cottage gardens, and ground cover. It tolerates a wide range of soil types—loam, clay, and sandy soils—provided drainage is reasonable. Before planting, dig over the soil to a spade's depth and work in a handful of garden compost or well-rotted manure to improve structure and fertility, especially on thin sandy soils or heavy clay. Plant in March, April, September, or October. Autumn planting allows roots to establish before winter, while spring planting suits colder, wetter sites. Space plants 50 cm apart to allow for their mature spread of 50–70 cm; they will knit together to form a weed-suppressing clump within a couple of seasons. Dig a planting hole slightly wider and deeper than the root ball. Set the crown at soil level—not buried, not proud—and firm the soil gently around the roots to eliminate air pockets. Water thoroughly after planting to settle the soil, even if the ground is already moist. Apply a 5 cm layer of garden compost or bark mulch around the base, keeping it clear of the crown itself, to conserve moisture and suppress weeds while the plant establishes. If planting in spring during a dry spell, water weekly for the first month. Autumn-planted geraniums usually need little additional watering unless the season is exceptionally dry. No staking is required; the clump-forming habit is sturdy and self-supporting, even when the foliage reaches its full height of 40–60 cm.