3 pruning groups
1. Salvia Herbaceous Deciduous
(Love and Wishes, Amistad, Mystic Spires Blue))
The herbaceous salvias are those that tend to die back to the ground in winter.
The difference between a colder and a warmer area is that in the warm zone the sage can bloom in winter and keep its leaves.
In the mild winters here, in center and south of UK they can stay alive and even bloom all winter.
Either way, anywhere, the cut is the same.
Leave the stems until spring and fresh new growth can be seen, then cut the stems down to their lowest shooting node. If new shoots are growing from the base so you can cut the old stems away completely.
After warm winter, if the stems are still alive, you can cut them to about 30 – 40cm above ground level (depending on how you want it to look.
2. Salvia Herbaceous Rosette Forming
(Sensation Pink, Sensation White, all Nemorosa)
These salvias form low rosettes, which are evergreen.
In fall, prune the stems all the way down to the rosette and clean up any dead foliage growing close to the ground. You can see a distinctive new shoots forming at the base of the plant in autumn to early winter.
This group of Salvias is easy because you can simply chop off all of last year’s growth in spring when frost is no longer expected.
3. Salvia Herbaceous With Woody Stems
(Hot Lips, Dyson's Joy, Jezebel)
This Salvia form a woody bush that doesn’t die back in winter.
Leave growth on through winter to protect the plant from cold, then cut back when new growth is spotted in early spring.
Remove all dead, diseased or damaged stems, then, cut back by about a third to a half to a growing point.
If you want a larger shrub it’s best not to cut below the lowest shooting nodes.
Make sure you cut after two pairs of leaves with shoots between them.
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