Posted: 23/06/2016 at 17:05
Try to have a plan so you have contrasts of plant and leaf size, form and shape and then think about flower colours. Plant in 3s, 5s or 7s for impact so that each plant is clearly visible and doesn't get lost in a polka dot effect.
As for choices, it depends on your soil - what will grow - and your taste - what you want to grow - and your budget eg finds lurking in the bargain corner or fine specimens in a specialist nursery.
Try growing from seed - it's cheaper and you can get more interesting varieties than those offered by big chains. Ditto divisions and cuttings swapped with gardening friends.
Don't forget bulbs for spring. They'll be in the shops form late August.........