They outline the best spring bulbs to plant in September, and which hardy choices still cope with an October or November slot. Why September bulb planting shapes your spring colourMirela Bajic, senior garden designer at House Designer, says "Spring gardens are made in September," and tells Good Housekeeping, "It’s the month that decides what your spring looks like. The best spring bulbs to buy now and plant in SeptemberDesigners put daffodils at the top of their list. Gabby LaRussa, founder of Flower Gypsies, tells Good Housekeeping, "September is the golden window for spring bulbs. Gardener and writer Stephanie Hafferty tells Good Housekeeping, "I’ve found that daffodils are remarkably robust and are fine planted in late October or even November, weather permitting.