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Sallis Chandler Landscape Designers and Gardeners
spaceDesign and Advice Garden Styles Garden Features Aftercare

Herbaceous Plants

Seasonal Maintenance

Summer
All summer flowering herbaceous plants should be regularly deadheaded (unless seed heads are a feature) as this prolongs the flowering period and prevents plant's energies from being diverted into unnecessary seed production.

Tall herbaceous plants
60 cm+ such as Delphinium, Lupin etc MUST BE STAKED. These need staking early in the summer using tripods of sticks with string or wire hoops. They then careful attention when growing to ensure they do not 'flop' over. Staking must be gradually raised, as the plants get taller.

Medium-sized herbaceous plants
up to 60cm such as, Geranium, Nepeta etc: Where growth becomes leggy, especially after flowering, trim back flowers and foliage if required to promote bushy growth.

Herbs & Crevice plants
Generally, herbs & crevice plants need to be kept neatly trimmed to avoid them getting too straggly or leggy. This is best done after flowering & again in the spring if necessary.

Autumn/Winter
When the foliage of deciduous herbaceous plants has died back fully it should be cut off. This can be composted.

In years to come herbaceous plants will increase and can become overcrowded. They will need to be lifted and divided up and replanted. This should be done in the autumn once all the foliage has died back.

Spring
Semi-evergreen plants e.g. Ferns, Hellebores, and
Euphorbia:
These should keep their leaves over winter. When leaves of fresh new foliage start unfurling the tatty, old foliage should be removed to allow the new to fill out.
Euphorbia: After flowering cut out the flowered stems to ground level to allow new shoots to grow through from base.

CAUTION
Sap of Euphorbia is poisonous and may cause skin irritation.

herbaceous border

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