Ornamental · Lamiaceae
Woodland Sage
Salvia nemorosa
Give it sun and sharp drainage, and this easygoing sage sends up violet flower spikes from early summer well into autumn.
Full sun
Every 7–14 days
USDA 4–8
2–3 ft · 0.5–0.9 m
Overview
Woodland sage belongs to the mint family, and it settles into a border happily without much fussing from you. Once early summer arrives it pushes up crowded spikes of violet-blue flowers, and bees and hummingbirds will visit them for weeks on end. Snip the flowers off as they tire, and the plant kindly sends up a fresh round for you.
If you tend to forget a plant now and then, this is a good one to begin with, because it truly thrives on a little neglect. Established roots carry it through dry spells, summer heat barely fazes it, and it comes back faithfully after winters as cold as zone 4. Deer and rabbits usually pass it by as well, turned off by the scented, faintly sharp leaves.
One worry you can set down: this gentle garden salvia is nothing like the psychoactive Salvia divinorum that shows up in headlines now and then. The two only share a genus and a nickname, and Salvia nemorosa is a perfectly harmless ornamental you can plant wherever children and pets roam.
Care
The short version: full sun, gritty soil that drains freely, and a gentle hand with the watering can once it has rooted, followed by a friendly trim after the first flush so a second wave of flowers can arrive. None of this is hard, and small slips are easy to fix.
Light
Find woodland sage a spot with full sun, ideally six hours or more each day. A touch of afternoon shade will not trouble it, but where shade grows too deep the stems reach and weaken, the flowers grow sparse, and the clump tends to fall open.
Water
Keep a new planting watered until its roots take hold, and after that you can relax and water far less. Grown-in plants are happily drought-tolerant and like to dry out between drinks, somewhere around every 7 to 14 days, since sitting in wet soil is what leads to root rot and fungal trouble.
Soil
Any well-drained soil will do, and the leaner and grittier it is, the happier the plant. It settles in nicely at a slightly acidic to neutral pH of 6.0 to 7.0, and sandy or gravelly ground serves it far better than rich, heavy earth that stays soggy around the crown.
Temperature
This is a tough little plant at both extremes, weathering cold down to about -29°F (-34°C) and taking summer warmth up to 90°F (32°C) in stride. That wide comfort range is exactly why it winters over dependably across zones 4 through 8.
Humidity
You can forget about humidity readings altogether, since ordinary outdoor air suits it fine. What matters far more is gentle air movement, because still, muggy air trapped around packed-in plants is what invites powdery mildew.
Feeding
Here is a plant that honestly prefers to go a little hungry. Set into decent soil with a bit of compost mixed in, it wants almost no feeding at all, and a generous dose of fertilizer only encourages soft, floppy growth and more disease.
Pruning
Through the summer, trim the faded spikes back down to the low basal leaves, and you will keep the fresh flushes of bloom coming. Let the stems stand through winter to shield the crown from cold, then clear away the old growth in early spring as soon as you spot new shoots.
Repotting
Salvia seldom asks to be divided, but fading flowers, a clump that thins and dies out in its middle, or stems growing crowded are its way of telling you the time has come. Gently lift and split the clump in early spring to give it a fresh start.
Size & spacing
Expect plants to reach 1.5 to 3 feet (46 to 91 cm) tall and to spread 6 to 24 inches (15 to 61 cm) wide. Give each one enough elbow room that air can drift freely between the clumps, which goes a long way toward keeping mildew away.
When to plant
Woodland sage is wonderfully cold-hardy, dying back and returning under its own steam each year. Start seed indoors toward the end of winter, move the young plants outdoors in spring once frost has passed, and the flower spikes will open from June to September, coming back into fall for you each time you keep them trimmed.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: About 12 weeks before planting time
- Plant: Spring after last frost
- Harvest: June to September, repeating into fall with deadheading
Hardiness
USDA hardiness zones: 4–8
Temperature: down to -34°C
Troubleshooting
Take heart, salvia is among the most forgiving perennials you can grow, and nearly all of its hiccups come down to a bit too much water, not quite enough sun, or clumps grown too close. Find your plant's symptom below, and know that fixing the growing conditions usually sets things right without any spray.
The entire plant wilting and going limp even after watering
When a salvia collapses quickly in hot, sticky weather, the culprit is usually Southern bacterial wilt or Southern blight, and sometimes a root or stem rot brought on by waterlogged ground. Sadly this one cannot be nursed back, so lift the plant and dispose of it rather than adding it to the compost. Your best protection going forward is quick-draining soil, plenty of sun, and a careful, sparing hand with water.
Fix:
- Remove and destroy affected plants
- Improve soil drainage
- Avoid overwatering and overhead irrigation
A dusty white film creeping over the leaves
That coating is powdery mildew, and it takes hold when the air goes still around damp, overcrowded clumps. Open things up by thinning and dividing your plants so a breeze can pass through, water down at the soil instead of over the leaves, and gently take off the most heavily coated foliage. A sunny, free-draining spot keeps it from returning, so there is no need to worry.
Fix:
- Improve air circulation by thinning and dividing clumps
- Avoid overhead watering
- Remove and discard affected foliage
The clump falling open and sprawling by midsummer
Flopping usually means the plant is a little too comfortable, with rich ground, deep shade, or too much fertilizer coaxing out soft, weak stems. Cut the tired stems back to the basal leaves and it bounces back shorter and tidier, blooming again for you. Grown in full sun and lean, freely draining soil, it holds itself upright just fine.
Fix:
- Cut back spent stems to basal leaves to promote compact rebloom
- Grow in full sun and lean, well-drained soil
- Avoid over-fertilizing
Toxicity
Here is a reassuring note for anyone with pets or little ones underfoot: garden salvia is safe from top to bottom. The ASPCA counts sage among the plants that pose no harm to cats, dogs, or horses, and the scented leaves taste bitter enough that most animals give them a wide berth. This is the friendly border plant, not its unrelated psychoactive cousin.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
Perfectly safe around cats. That strong, minty smell rising off the leaves is usually enough to keep even a nosy cat from taking any interest.
Dogs None
Nothing here to worry a dog owner. A pup that chews a leaf might feel a little queasy from the sheer amount, yet the plant holds no actual toxin.
Horses None
Counted as non-toxic to horses, so you can plant a salvia border near a paddock or grazing patch with an easy mind.
Rabbits Safe
Gentle on rabbits, who usually walk right past it anyway. That scented foliage is a big reason salvia gets sold as a rabbit-resistant choice to begin with.
Livestock Safe
No threat to cattle, goats, or sheep. The sharp, pungent leaves taste unpleasant, so grazing animals rarely bite it even when it stands well within reach.
Birds Safe
Completely safe for birds, and better still, those little tubular flowers call in hummingbirds and other pollinators looking for nectar.
People Safe
Safe to handle and to grow wherever children play. Remember this is the ordinary garden salvia, not the psychoactive Salvia divinorum, which is a wholly separate plant.
Aromatic foliage is generally unpalatable; not a known toxicity hazard. Distinct from the psychoactive Salvia divinorum.
Varieties
Nearly all the salvias you will meet are forms of Salvia nemorosa or its hybrids, chosen for deeper color and a neater habit. A handful show up over and over on garden center benches, and those familiar few are the ones worth getting to know first.
Caradonna
This one is easy to love for its near-black, dark purple stems holding up bright violet-blue spikes, standing about 30 inches tall.
May Night (Mainacht)
Crowned Perennial Plant of the Year back in 1997, this compact favorite carries rich, deep violet-blue blooms.
Ostfriesland (East Friesland)
A neat, compact grower topping out near 18 inches, dressed in deep purple flowers.
Companions
Woodland sage pairs best with other sun-loving, drought-tolerant perennials that want the same lean, well-drained soil, filling out a pollinator or cottage border alongside them.
Plant near
Coreopsis: Shares full-sun, well-drained, drought-tolerant conditions in perennial and pollinator borders
Echinacea (coneflower): Similar sun and soil needs; complements salvia in butterfly and cottage gardens
How to propagate
Making more salvia is refreshingly simple, though the method that suits you depends on whether you are growing the plain species or a named cultivar.
DivisionEasy
Early spring when new growth begins · One growing season
The gentlest way to make more salvia is simply to divide it. In early spring, just as fresh growth begins to rise, lift the clump and pull it into pieces, and each division settles in and fills out comfortably across one growing season.
Stem cuttingsModerate
Late spring to summer · Several weeks to root
You can also take softwood cuttings from shoots that are not flowering, snipped in late spring or through summer. Trim a healthy shoot, tuck it into damp potting mix, and give it a few weeks to send out roots of its own.
SeedModerate
Sow indoors about 12 weeks before planting time · One growing season to flowering
The plain species comes along easily from seed, started indoors about 12 weeks before planting time, and it reaches flowering in that very first season. Named cultivars such as Caradonna will not stay true from seed, so lean on cuttings or division to keep them just as they are.
Myths
Garden salvia is the same thing as the hallucinogenic salvia that the law controls.
The salvia in your border, Salvia nemorosa, is just an everyday garden perennial with no mind-altering effect at all. The plant behind the headlines is a different species entirely, Salvia divinorum from Oaxaca, Mexico, whose compound salvinorin A acts on the kappa-opioid receptors in the brain. They share only the name Salvia and nothing more.