With warm soil, returning humidity, and lingering long days, September is ideal for rejuvenating evergreen beds and potted perennials. Here's your expert guide to the month's key tasks.
For perennials, start by preparing the soil: loosen it (a light scarification often suffices) to 10-15 cm deep. Apply compost, vermicompost, or a balanced organic fertilizer derived from manure, algae, and plant or animal sources. Once prepped, it's prime planting time—assuming you've selected your varieties.
Source your potted plants from trusted garden centers, your own seedlings, divisions from home clumps, or generous shares from friends divesting invasive irises, sprawling solidagos, or those envy-inducing purple asters (when you prefer pink). Whatever the origin: plant now.
One key precaution: respect planting distances. Soon enough, you'll be like that neighbor overrun by asters—grabbing the spade to gift extras to friends coveting your pastel blues. Aim for about 9 plants per m² on average, 5 per linear meter for borders, or 1-2 per m² for peonies and hostas.
Skip patchwork or harlequin designs. For the best impact, stick to harmonious tones, accented occasionally by complementary colors. Water thoroughly, watch them bloom, and share your photos with us!
Mass planting of perennials backed by shrubs for a striking effect.
