Using a good quality multi-purpose compost, pot up your plugs into 10cm pots. Once your plug plants have been potted on and labelled, water them in well and grow on for around 5-6 weeks. Water once the compost starts to dry out.
If preferred you can pot on the plugs into hanging baskets, flower bags or pots. Add a slow release plant food like Miracle-Gro Slow Release All Purpose Plant Food to your compost which will give extra nutrients for strong and healthy plant growth.
Keep plants frost free until mid/late May and then harden off before being placed in their final positions when the risk of frost has passed in your area.
Water as necessary giving a liquid feed such as Neudorff Organic Plant Feed as instructed throughout the growing season.
***For packs of 20/40 plug plants gently remove the small plugs from the tray by pushing up from the bottom using a pencil.
Viola 'Rebecca' Advice
In a mild winter you may find that the plants do not die back entirely, but usually the growth will die back until the following spring and then regrow. It may be a good idea to label the plants so that you know where and what they are!
Give the plug plants a good soak when they arrive, then pot them up and grow on (as per instructions for perennials) before transferring them into the garden. Dead heading regularly will stop the flowers producing seeds and prolong the overall flowering season.