Horticulture Magazine

Unless You Want The Seeds, Make Sure To Deadhead Your Salvias Warns Vicki Weston

tall stems from a salvia shrub with small clusters of purple flowers growing along them
By ELIZABETH WADDINGTON

Elizabeth is a Permaculture Garden Designer, Sustainability Consultant and Professional Writer, working as an advocate for positive change. She graduated from the University of St. Andrews with an MA in English and Philosophy and obtained a Diploma in Applied Permaculture Design from the Permaculture Association.

/ Updated October 15th, 2024
Reviewed By ROY NICOL

Roy is a Professional Gardener and Horticultural Consultant, specialising in large garden year-round maintenance and garden development. He is an RHS Master of Horticulture and uses his research in the application of no-dig methods in ornamental garden settings. Roy has been a Professional Gardener for more than six years and is a member of the Chartered Institute of Horticulture, Professional Gardener's Guild and Association of Professional Landscapers (Professional Gardener).

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Contributions From LYNDI GARNETT
Lyndi Garnett, Coordinator for the Victorian Salvia Study Group

Lyndi was one of the founding members of the Victorian Salvia Study Group when it was set up around 20 years ago, after previously being a member of the Victorian Herb Society. She now works as Coordinator for the study group - a role she has held since 2013. Previously, Lyndi also worked as a Landscape Designer.

, VICKI WESTON
Vicki Weston, Owner of Weston's Salvias

Owner of Weston's Salvias, Vicki has been nursing and selling plants online for 10 years from her home in West Wales, near the coast of Cardigan Bay. She offers nearly 100 salvia varieties for sale, has been featured in various online publications and has delivered talks to various clubs up and down the country.

Salvias can be a wonderful choice for a UK garden.

These wildlife-friendly plants can, when cared for correctly, bloom for a long period over the summer months and sometimes even beyond.

Deadheading is one of the jobs to undertake if you are growing these plants in your garden.

“You should tip prune your salvias regularly to keep them bushy,” says Lyndi Garnett, one of the founding members of The Victorian Salvia Study Group.

As Lyndi says, deadheading is important for salvias because it will encourage the plants to put their energy into producing new flowers and blooming over a longer period, rather than going to seed.

Salvia microphylla var. microphylla (Blackcurrant Sage) flowering in summer

Of course, if you want to collect seeds from your salvias then you should not deadhead too zealously – and should allow them to enter their seed-producing phase.

However, if you would rather enjoy their flowers over a longer period, then keep reading.

1) Prepare Your Tools

a cloth being used to clean the blades of orange secateurs

Whenever you are deadheading or pruning, it is very important to make sure that your tools are sharp and clean.

Blunt tools can cause damage to plants and, if you do not practice good hygiene in the garden, they can inadvertently spread disease.

Make sure you have some sharp, clean secateurs ready for this job.

2) Wait For Blooms To Fade

Salvias tend to start to bloom in May or June and can bloom right through the summer if you deadhead them.

If you don’t, then the flowers will bloom only until around midsummer before they go to seed, although you can deadhead at different times of the year too:

“Generally, salvias can be deadheaded at any time of the year, but they must be pruned at least once, ideally twice a year,” says Lyndi.

brown withering salvia flowers turning to seed with purple blooms still on show

In the middle of summer, you should check over your salvias and look for any flowering stalks that are turning brown.

The brown colouration will begin at the base of the flowering area and work its way upwards.

Once around 70-80% of the blooms on a flowering spike have faded and turned brown, it is time to consider deadheading by removing that particular flowering stem.

3) Deadhead Spent Flowering Stems

gardener using a pair of secateurs to deadhead a salvia shrub growing outside

Cut off any spent flowering stems where the stem meets the highest set of leaves on the plant.

Cut through the stem at this point with your clean and sharp secateurs.

New flowering stems should usually grow off the sides of the existing stems.

You may wish to repeat this process over the summer to ensure as long a blooming period as possible.

“Don’t cut them back in autumn!” warns Vicki Weston, owner of Weston’s Salvias.

“Although the plants will look a bit bare in the deepest parts of winter, wait until you can see green shoots at the very base of the plant, then you can tidy back and deadhead to a neat shape.

“You’ll have to be patient with some but they will all shoot.”

4) Feed In Mid-Summer

water being poured from a spout into the compost of a salvia plant

“Remember to feed and mulch your plants after any kind of pruning,” says Lyndi.

Feed your salvia with an organic, potassium-rich liquid plant feed in the middle of the summer, especially when growing in containers.

This will help increase the chance of further blooms and keep your plants as healthy as possible.

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