If you plan to set out your plants in beds or borders or to plant them into large tubs, pot them first into 9cm/3½in pots. Use any good multi-purpose compost and set each one so that the top of the plug is just below the surface. All young plants that are to go out into the garden, even the hardy ones, should be hardened off during May. Stand them outside in the day and bring them in again on cold nights before locating them in their final positions outside at the end of May / beginning of June.
Most of our young plants prefer a sunny or lightly shaded spot. They will have roots that have filled their pots after around 3 weeks.
When you plant up your containers and baskets, multi-purpose compost is usually best, and we recommend that you mix with it water-retaining gel granules and a slow-release fertiliser. Together they will save you time with both feeding and watering, although additional liquid feeding may still be needed later in the season if plants start to lose vigour.
Always keep your plants free of weeds and water well in dry spells until they are fully established. Slugs and snails are a major threat to the young growth of many plants and appropriate precautions should be taken.
When planting containers and baskets, always select an appropriate pot size for the type of plant you have chosen and the look you want to achieve. For instant impact with summer displays, you can pack plants in to give more impact, we suggest about 7-9 plants per 40cm diameter pot. For permanent displays consider the growth rate and eventual size of the plant.