A richly pigmented basil with the same aromatic punch as green sweet basil, adding deep burgundy color to beds, borders, and plates alike.
Ocimum basilicum var. purpurascens · also called Dark Opal basil, Purple Ruffles basil
Windows are counted from the average date of your last spring frost.
The anthocyanin pigments (the same class of compounds that color red cabbage) that give the leaves their deep purple hue also make it a striking ornamental. It performs identically to green basil in the kitchen while doubling as a bedding plant.
A little history. Purple coloration in this variety results from elevated anthocyanin pigments in leaf tissue. Coloration intensifies under high light and moderate stress; shaded plants often revert toward green. Native range of the species is tropical Asia and Africa.
Press seeds onto moist mix; do not bury deeper than ¼ inch. Keep surface evenly moist — let it dry even once and germination stalls. Seedlings emerge in 5–10 days in warm soil.
Sow seeds ¼ inch (6 mm) deep.
Either works well — needs at least 8 inches of soil depth and excellent drainage. In containers: 2-gallon pot minimum; 5-gallon preferred for sustained harvest. Space plants 12 inches (30 cm) apart.
Water deeply when the top inch of soil feels dry, roughly every 2–3 days in warm weather. Water when leaves begin to lose their slight sheen and look marginally dull before wilting — water then. Aim for about 1 inch per week including rain; more in containers.
Side-dress (scatter fertilizer along the base and water in) or apply liquid feed every 3–4 weeks. What to use: balanced 5–5-5 organic or half-strength fish emulsion; avoid high nitrogen, which dilutes flavor.
Pinch out the growing tip (the topmost cluster of leaves) once plants reach 6 inches tall, and remove any flower spikes (bolting stems) as soon as they appear. This keeps the plant bushy and delays the shift to seed production.
It's ready when harvest once plants have at least 6 sets of leaves. Pick stems just above a leaf pair. Flavor peaks before any flower buds open. Cut stems back to just above the second or third set of leaves from the base using clean scissors. Never remove more than one-third of the plant at a single harvest.
Do not refrigerate — cold blackens leaves within hours. Stand cut stems in an inch of water at room temperature, loosely covered, for up to 5 days. Freeze as pesto for longer storage.
Sow a new batch of seeds indoors every 3–4 weeks from late winter through midsummer to maintain a continuous supply through the season.
Tomato
The strong-smelling foliage can help hide tomatoes from thrips and whiteflies that hunt by scent, and trials show the effect is modest rather than absolute. Both crops want the same warm soil and steady water, so they share a bed easily.
Bell Pepper
Peppers and basil want identical conditions — warm soil, full sun, even moisture — and basil's low bushy frame shades the root zone without stealing light from taller pepper plants.
Oregano
Gardeners have long grown these two mint-family herbs side by side; they share sun and drainage needs and neither crowds the other. Give oregano its own corner, since it spreads wider each year.
French Marigold
French marigold flowers feed hoverflies and tiny parasitic wasps that hunt aphids on new basil growth. Its root-knot nematode suppression only works when planted thickly or turned into the soil at season's end, not as a few edge flowers.
Sage
Old charts keep these apart, and there is a practical reason behind the tradition: sage prefers lean, dry soil while basil wants steady moisture and regular feeding, so one is always watered wrong. Grow them in separate pots.
Fennel
Fennel roots release compounds that stunt most garden vegetables, basil included — expect slowed, stalled seedlings nearby. Planted well apart at the garden edge, its flat flower heads feed hoverflies and tiny parasitic wasps, so it still earns a place.
Easy-going — Purple Basil can grow almost anywhere in the rotation without a strict rest.
The pea and bean family, the cabbage family or the tomato family thrive in this ground next season.
Basil is a light feeder and pulls little from the bed, leaving soil in good shape. Leave a one-year gap before basil returns to the same spot. Peas or beans, a cabbage-family crop, or tomatoes and peppers all follow well here.
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