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August Herbaceous Border Tips

Haircut Time!

Many of the most colourful herbaceous border plants will be finishing flowering now.   They all need a gentle pruning to remove old flower heads and leggy new growth. This will shape them up into good condition for next year and my well also encourage a second flush of flowers.
 
Pruning should not extend back to bare stems.
 
In this category would be:-
Cistus
Salvia

Athemis

Pruning Anthemis 1click for larger image
Pruning Anthemis 2click for larger image
Pruning Anthemis 3click for larger image
Pruning Anthemis 4click for larger image

Cosmos

Erigeron

Pruning Erigeron1click for larger image
Pruning Erigeron 2click for larger image
Pruning Erigeron 3click for larger image

Erigeron 'Sea Breeze'

Pruning Erigeron 'Sea Breeze' 1click for larger image
Pruning Erigeron 'Sea Breeze' 2click for larger image
Pruning Erigeron 'Sea Breeze' 3click for larger image
Pruning Erigeron 'Sea Breeze' 4click for larger image
Pruning Erigeron 'Sea Breeze' 5click for larger image

Erysimum (Perennial Wallflower)

Helianthemum

Pruning Helianthemum 1click for larger image
Pruning Helianthemum 2click for larger image
Pruning Helianthemum 3click for larger image
Pruning Helianthemum 4click for larger image

Herbaceous Geraniums

These too will be finishing flowering.   Early Summer flowering varieties may be well over already.   Cut all the leaves off your plants if they look scruffy and they will soon re-grow and even reward you with second flowering.

Pruning Geraniums 1click for larger image
Pruning Geraniums 2click for larger image
Pruning Geraniums 3click for larger image
Pruning Geraniums 4click for larger image
Pruning Geraniums 5click for larger image
Pruning Geraniums 6click for larger image

Hedychium and Canna – after a slow start these plants will now be developing quickly ready to flower next month. Regular foliar feed will encourage best results but do watch out for slug damage and keep well watered.
 
 

Feeding Hedychium 1click for larger image
Feeding Hedychium 2click for larger image
Feeding Hedychium 3click for larger image

Lampranthus

Now is the moment to prune up the season’s growth on your Lampranthus and other succulents.   Do not throw the prunings away but use them to make cuttings (they root very easily indeed with no special treatment in the greenhouse – just stick them in a pot!) in case these tender plants are killed over Winter.
 

Tricyrtis

If you do not know this unusual plant, the Snake Lily, why not give it a try?   It is at its best in August.
Tricyrtis
 


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