Salvia splendens Seeds | Scarlet Sage
.jpg "Scarlet Sage (Salvia splendens) seed")
LATIN NAME: Salvia splendens
COMMON NAME: Scarlet Sage, Jewel of the Nile
Plant Profile
In its Brazilian home the scarlet sage is a billboard for hummingbirds. The long, brilliant-red spikes are shaped and coloured exactly for a bird that sees red and hovers to drink, and the flower packs the nectar at the base of a tube sized to a beak. Move it to a cool garden and the bees take over the job, but the signal was built for a bird.
Salvia splendens is a bushy, upright member of the mint family, square-stemmed and opposite-leaved, reaching a metre in a warm bed. From early summer into autumn it carries whorled spikes of two-lipped red flowers followed by small brown nutlets, and the show is long enough to carry a border through the whole hot season.
What looks like one red spike is a stack of verticillasters, whorls of flowers set in rings up the stem, each whorl opening in turn from the bottom up. That staging is why a spike stays in colour for weeks instead of days, and why a cut stem keeps flowering in the vase as the upper rings open.
Modern lines are chosen for a short node, a broad base and an even break, so a flat of scarlet sage looks like one plant copied. The gain is a tidy bed; the loss is some of the wild height that hummingbirds preferred, which is why the native birds visit the tall heirlooms and the bees work the bench types.
The crop has a known weak spot in downy mildew of the lamb’s-quarters type, which yellows the leaf and ruins a flat in wet weather. Clean stock, air flow and a wary eye are the controls, because once the grey fuzz shows under the leaf the stand is already lost and the bench is a write-off.
Science & Biotechnology
Like its mint-family cousins, scarlet sage packs rosmarinic acid and related phenolics in the leaf, the compounds that give the family its bitter, aromatic edge. They are not the reason anyone grows the plant, but they explain the faint resinous scent when the stem is crushed.
Assays of the foliage pick up the same phenolic pattern seen across Salvia, with rosmarinic acid leading and smaller flavonoids behind it. The profile is a family signature rather than a scarlet-sage special, which is useful for quality work but not for the garden bench where colour is the point.
Uses & Benefits
The plant came out of the Atlantic forest and was carried to Europe in the 1800s, where breeders ran with it. The wild form is a tall, loose red, and the garden forms are shorter, denser and now come in colours the forest never saw, a clean example of a species remade by the bedding trade.
The flower and leaf hold only a trace of essential oil, far less than the culinary sages, so scarlet sage is grown for the eye, not the still. The scent at crush is light and green, a reminder of the kinship rather than a perfume in its own right, and the plant is best read as a bedding subject.
Set the plants out at roughly twenty-five centimetres apart once they reach a hand’s span, and water them in well. The open flowers feed bees and, in warm regions, the hummingbirds they were built for, so a row of scarlet sage is also a pollinator strip that repays the bed with a busier summer.
Growing from Seed
The classic scarlet is still the best seller, but selection has produced salmon, white, purple, pink and bicolour forms, some compact enough for a pot and some tall enough for the back of a border. The habit changed too: the old loose spike gave way to the tight, uniform bench plant that fills a tray.
Sow in warmth and light, because the seed needs both to break evenly, and start early so the plants are in flower by the time the bed is set. The seedling is tender, so hold it under cover until the cold is past and the soil has warmed, and pinch the tip once it has a few node pairs to force a bushy pot.
Press the fine seed onto the surface of a fine mix and keep it bright and just damp, then prick out when the first true leaves are open and the stem stands a couple of centimetres tall. Do not bury the seed, because it wants light to move, and a crusted mix keeps it shut while the bench dries.
Our Take
Scarlet sage is the dependable red of the summer bed, and the heirloom tall form is the one to grow if you want hummingbirds. For other sages see the garden sage, the red sage herb, and the clary sage.
Related Reading
More species in the same orbit as Scarlet Sage: