We’re pretty sure that we don’t need to tell you how much it pays to prevent slug damage and to protect the pots from cats and other creatures with garden fleece and netting.
Keep your Columbine seedlings moist with watering and give them a liquid feed occasionally – we find that tomato food, which you may well be using in summer anyway, is ideal.
When it comes to deadheading, this isn’t a necessary step for Columbines. When dying, flower petals will naturally fall and also self-seed, allowing new plants to develop the following year. We weren’t lying when we said they were easy to grow! They do half of the process for you! If you’d rather have strict control over the population of Columbine flowers in your garden, however, deadhead when the flowers are dying.