Corydalis are fully hardy perennials and will be fine outdoors throughout winter. They don’t require frost protection. They should be planted between September and mid-November for best results, but can also be planted into December providing the bulbs are still fresh and healthy. If you’re not ready to plant them as soon as you receive them, you can store them in a cool, dry place for a few weeks. They won’t stay fresh beyond early December or store until the following year.

— Corydalis tubers can be planted directly outside in borders or patio containers.

— If you have a heavy soil or soil with a high clay content, it is a good idea to incorporate some compost, grit or sand prior to planting to aid drainage.

— If planting in containers, we recommend using peat-free multipurpose or soil-based compost.

— They grow well in sun or shade – ideally they like a position in partial or dappled shade.

— Plant the bulbs around 10-15cm deep with the ‘eyes’ facing upwards.

— Space the bulbs around 15-20cm apart from each other or slightly closer in containers for a full display. They look best planted in groups or clusters in borders.

— Cover back over with soil/compost after planting. If the soil is very dry, it’s a good idea to water them in after planting to settle them. They will not require any further watering through winter unless it is very mild and dry.