You only need subtle shade changes to achieve a striking effect with well chosen plants. Good companions complement one another in a range of ways.

These Euphorbia and Crocosmia work well together due to the shape and forms of the leaf and the similarity and warmth of colour.
Crocosmia will flower in a hue like that of the Euphorbia but later in the summer – see images.

For more information on Euphorbia read Top Ten Euphorbias

For more pictures and growing tips on Crocosmia see link

These Malva moschata are easy to grow perennials that flower strongly in mid summer. The pastel shade of pink is also picked out in the eye of the virtually white flower.
The plants are included in a white bed at Burnby Hall where the pink is used onlt to accentuate the balance of whiter flowers elsewhere in the bed.
Malva can be grown from seeds supplied by Thompson Morgan These germinate easily within 28 days and can be sown in a tray or pot. Prick them out into individual 3in pots when young and plant them out when the roots reach the bottom of the pot. If sown in April or May they will flower in their first year; if sown now, the plants will wait until next year.

Val Bourne in the Daily Telegraph in 2003 recommended other companions for Malva ‘The white form, ‘Alba’, will grow in semi-shade and combines well with the dark hardy fuchsia, ‘Mrs Popple’, and the deep-rose Japanese anemone A. x hybrida ‘Montrose’. Dark penstemons and Agastache urticifolia ‘Liquorice Blue’ provide another good contrast to both the white and pink forms.’