Autumn and Spring are both ideal for planting perennial plants, allowing for strong root development and healthy growth. Dates will be earlier in the South West, later in cold Northern & Scottish regions. Early Autumn (September-October) Spring to early Summer, (late April-June) Midsummer (July-August) Winter (November-March) Most perennials we grow are fully hardy and live outdoors year… Continue reading Herbaceous Perennial Planting Seasons