Russian sage creates a lavender-blue cloud in the garden from early summer to mid-fall. The tall purple spikes of airy blooms are eye-catching above the silver-green aromatic foliage and attract butterflies. It looks luxurious, but it’s really a workhorse in the garden, vigorous, hardy, and drought tolerant. This shrub thrives in USDA plant hardiness zones 4-9.
Russian sage care is minimal, but it does include pruning. It should be pruned every year to keep it neat and compact, but don’t think it reduces the blooms. Pruning is also necessary to get this perennial to bear the most flowers possible, keeping the plant vigorous.
Are you ready to start cutting back your Russian sage? Read on to learn how and when to prune Russian sage.
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When to Prune Russian Sage
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Russian sage (Salvia yangii) is a perennial that goes dormant in the winter. Many deciduous plants are best pruned during their dormancyand Russian sage is one of them. Pruning while the plant is “sleeping” reduces pruning stress. The best time for pruning Russian sage is late winter or early spring, before new growth begins.
Can you prune in early winter? Yes, it is possible to prune Russian sage at any time during the plant’s dormancy. But the plant offers winter interest in the garden. The silvery green foliage disappears as cold weather arrives, but the silver stems and interesting seedheads remain appealing all winter long. In addition, the dry stems insulate the crown of the plant. Waiting to prune until late winter allows you to take advantage of this beauty.
How to Prune Russian Sage
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Even if you haven’t had very much experience with pruning shrubsyou won’t have any problem with Russian sage. This plant is not only very easy to prune, but it’s virtually impossible to over-prune.
The classic (and easiest) way to prune Russian sage is to cut it back hard while it is dormant in late winter or early spring. Trim each stem down to between 6 and 18 inches (15-30 cm). If you leave it taller (cutting it back to 15-18 inches), it will be a more impressive shrub when it starts to leaf out. The shorter you cut it back, the more compact the plant will be when it grows out.
Don’t forget to sterilize your pruning shears or loppers before you make any cuts. It’s also a good idea to wear garden gloves. I love wearing arm saver gloves, like these from the woman-owned business Womanswork on Amazon, to keep hands and forearms protected.
Mistakes to Avoid
Although pruning Russian sage is not difficult, there are pruning mistakes that would be better to avoid. Here are a few of them.
- Failure to prune. It may be tempting to just let your Russian sage grow naturally, without any pruning. But this road doesn’t end anywhere you want to be. If you don’t prune your Russian sage, the plant gets overgrown and woody. You have less and less flowers and more branches. It stops being a lovely plant and becomes an eyesore.
- Watering too much. Of course, regular irrigation is important when you are planting your Russian sage. But once it is established, cut back on the water. This plant is drought-tolerant. Too much extra water can lead to fungal issues.
- Forgetting to give the plant elbow room. If you plant two or more Russian sage shrubs, don’t put them too close together. Leave at least a space of 3 feet (1m) between plants to allow each one to develop. If they are too close together, no amount of pruning will make them look their best.
- Pruning in Summer. In summer, the Russian sage is in the midst of its growing season. Cutting back the plant then will not be good for the plant and may even kill it.
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