Spring bulbs
You plant spring bulbs in the autumn before the new garden season, preferably between September and December and before the first night frost. If the soil is too wet, it is better to wait. Otherwise, the bulbs may rot.
Not all spring bulbs bloom at the same time, of course. If you take this into account and plant several bulbs, your border or flower pot will remain colourful for a long time. Read here to find out which bulb flowers when.
Summer flowering bulbs
Summer-flowering bulbs, such as the calla and dahlia, should be planted in May, when the risk of night frost is past. These bulbs need warmth to grow, so make sure you do not plant them too deep in the ground. The summer flowers come up from July onwards and with a bit of luck they will provide fireworks in the garden until October.