Herb · Lamiaceae
Basil
Ocimum basilicum
Offer it sun, warmth, and a gentle pinch, and basil will fill your kitchen with fresh leaves all season long.
Full sun
Every 7–10 days
50–86°F · 10–30°C
60–90 days
Overview
If you are growing one herb this year, let it be basil. This tender annual belongs to the mint family and hails from the warm reaches of Asia and Africa, and it asks very little of you. It is quick to grow and fond of heat, so it settles in just as contentedly in a garden bed as in a pot on a bright windowsill, and a little sun and warmth bring you handfuls of sweet, fragrant leaves.
Basil lives out one happy season, reaching somewhere between 12 to 24 inches (30 to 60 cm) tall depending on which kind you choose. Leave it to its own devices and it will stretch up, bloom, and make seed, but a few minutes of pinching the tips turns all that drive back into leaf after leaf. That one small habit, more than anything else, shapes how full your harvest turns out.
Here is the reassuring part: basil is wonderfully forgiving of a new gardener, with only two things it really minds. It cannot take frost or cold ground, and it grows unhappy in muggy, crowded air where downy mildew likes to settle in. Keep it warm, give the plants a little elbow room, and water down at the soil, and you will find the rest comes naturally.
Care
The short version: give basil plenty of sun and warmth, keep the soil evenly moist, and pour your water low at the base so the leaves stay dry. A light feed now and then, frequent pinching of the tips, and patience until the ground warms are all it takes to keep it thriving.
Light
Treat basil to full sun when you can, around six hours a day or more, because that bright light is what coaxes out the flavorful oils. A bit of shade through the afternoon is fine where summers get fierce, but skimp on light and you end up with thin, floppy plants.
Water
Aim to keep the soil evenly moist, giving it a good soak every 7 to 10 days as the rain allows. Pots dry out quicker, so peek at those a little more often. Always send the water to the base, since damp leaves are exactly what downy mildew is waiting for.
Soil
Set basil into rich, well drained loam that you have mixed with some compost. It is happy with a pH from 6.0 and 7.5, which means most ordinary garden soil will do the job without any fuss from you.
Temperature
Warmth is where basil truly comes alive, somewhere around 50°F to 86°F (10°C to 30°C), and it speeds up toward the warm end of that span. Frost is out of the question and cold ground holds back young plants, so always let warmth lead.
Humidity
An everyday humidity of 40% to 60% suits basil just fine, so this is one number you can stop fretting over. The thing that truly counts is good airflow, because still, moist air around packed-together plants is just how downy mildew gets its start.
Feeding
A gentle hand wins the day here. Offer a balanced fertilizer like 5-10-5 just once or twice over the whole season, and that light touch keeps the taste vivid, because pushing too much growth waters down the oils.
Pruning
Get into the cheerful habit of pinching the growing tips, which nudges the plant to fill out with side shoots, and snip away any flower buds the instant they show. That gentle, regular pinching is the secret to a steady supply of leaves with their full flavor.
Repotting
Since it lives as an annual, basil hardly ever calls for real repotting. All you do is move seedlings up into bigger pots as they fill the ones they are in, well before roots begin to circle and the soil races to dry out.
Size & spacing
Each plant grows 12 to 24 inches (30 to 60 cm) tall and fills out 12 to 18 inches (30 to 45 cm) across. Leaving that much breathing space between them lets the air flow and keeps disease at bay.
When to plant
Warmth is everything to basil, and frost is its one true enemy, so timing makes all the difference. Get seeds going indoors toward the end of winter, hold off moving plants outside until every chill has truly gone and the ground has warmed, and from there you can gather leaves all summer until that first frost closes the season.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: 6-8 weeks before the last spring frost; germinates best at media temperatures of at least 70°F
- Plant: After all danger of frost when soil is warm and nighttime temperatures stay above 50°F
- Harvest: Harvest leaves continually once plants have several sets of leaves; pinch off flower buds to delay bolting and prolong leaf production
Hardiness
USDA hardiness zones: 2–11
Temperature: down to -46°C
Troubleshooting
When basil runs into trouble, the leaves are usually where it shows up first, be it a disease, a hungry visitor, or the plant simply trying to bloom. The good news is that catching those early hints lets you step in before things spread. Find the picture that matches yours below, and you will know just what to do.
Yellowing on the surface with a grayish fuzz hiding beneath
What you are seeing is basil downy mildew, and it spreads quickly where the air sits still and the leaves stay wet. Try not to feel bad if it shows up; once that fuzz appears the plant cannot be brought back, so the kindest move is to lift it out and bin it right away. For your next round, leave more space between plants, keep your water aimed low at the soil, and reach for a tougher pick such as 'Prospera'.
Fix:
- Remove and destroy affected plants immediately
- Increase plant spacing and prune for airflow
- Water at the base to keep foliage dry
A fast collapse with brown lines tracking up the stem
This one is Fusarium wilt, a fungus living in the soil that blocks the stem from within, and sadly there is no bringing the plant back once it sets in. Lift the affected plant and throw it in the trash rather than the compost heap, then make a fresh start in a clean spot with new media. You can keep this trouble away for good by choosing resistant types and seed known to be clean.
Fix:
- Remove and destroy infected plants
- Do not compost affected material
- Replant in a different location or use fresh sterile media
Soft brown roots and a droopy plant in chilly, soggy ground
Root rot creeps in when the ground stays soaked or too chilly for the roots to keep up. The roots tell the story plainly: instead of staying firm and pale, they go mushy, brown, and unpleasant to smell. Take heart, because the answer is in your hands. Help the water drain away, water a little less often, and hold off setting plants out until the ground feels warm, above 50°F (10°C).
Fix:
- Improve drainage and reduce watering frequency
- Remove severely affected plants
- Allow soil to dry between waterings
Buds rising at the tips while the leaves lose their flavor
Nothing has gone wrong here; this is just bolting, the natural urge to make seed once the plant matures or the weather turns long and hot. After the flower spikes show, the leaves that follow arrive smaller and taste a bit milder. The fix is wonderfully simple: nip those buds off the moment they appear and keep picking leaves, and your plant stays lush and full of taste.
Fix:
- Pinch off flower buds as soon as they appear
- Harvest and prune leaves regularly to delay flowering
Tattered holes nibbled clean through the foliage
You have a couple of likely visitors here, and both are easy to deal with once you know who they are. Japanese beetles work in daylight and leave behind little more than a skeleton of veins, while slugs and snails do their feeding after dark and leave glossy trails as their calling card. Drop the beetles into soapy water, put out traps or barriers for the slugs, and a quick check now and then keeps either from getting ahead of you.
Fix:
- Hand-pick beetles into soapy water
- Apply insecticidal soap for soft-bodied pests
- Set out slug traps or barriers
Toxicity
You can breathe easy with this one. Basil is completely non-toxic and grown to be eaten, so it sits safely alongside cats, dogs, horses, rabbits, livestock, birds, and your children too. If a curious pet helps itself to a big mouthful, the most you might see is a brief, gentle bit of tummy upset that clears up all on its own.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
You can relax with cats around, since a taste of basil will not hurt them in the least. Should one make a real meal of it, the most that may happen is a little comes back up, and that settles by itself.
Dogs None
Your dog is welcome to a mouthful of basil with nothing to fear. Even a generous helping tends to cause no more than a passing tummy grumble that soon eases off.
Horses Safe
There is no need to worry about horses near basil. The plant holds nothing that could do them any harm.
Rabbits Safe
Feel free to let rabbits nibble basil as they please, and plenty of them happily treat the fresh leaves as a favorite snack.
Livestock Safe
Should goats, sheep, or cattle wander over for a browse, basil will leave them perfectly well.
Birds Safe
Birds have nothing to fear from basil, and backyard hens often enjoy a peck at the tender leaves.
People Safe
Grown for the table from the start, basil is meant to be eaten fresh or cooked, and it sits well with grown-ups and little ones alike.
No special handling precautions are needed; basil is non-toxic and edible.
Varieties
There are more basils out there than you could ever try, from sweet Italian sorts to spicy and pretty ornamental ones, yet only a few show up in garden after garden. Here are the ones it pays to know.
Genovese
This is the broad-leaved Italian sweet basil everyone pictures and the one you want for pesto, with its lovely flavor offset by the highest vulnerability to downy mildew.
Thai basil
Recognizable by its purple stems and its anise-licorice taste, this type grows 24 to 36 inches tall and forms the backbone of so many Southeast Asian dishes.
Purple Ruffles
Prized chiefly for the way its deep purple, frilled foliage looks in the garden, this one earns its keep on looks as much as in cooking.
Spicy Globe
Staying a neat 8 to 10 inches in a rounded little mound, this compact basil tucks happily into containers and along bed edges.
Prospera
Bred in the Genovese style to brush off downy mildew, this variety keeps a tidy shape that takes well to life in a pot.
Companions
Basil earns its old reputation as a tomato's best neighbor, sharing the same warm, sunny, well-drained ground the two crops both want.
Plant near
Tomato: Basil is a traditional interplanting companion for tomatoes in the vegetable garden, sharing similar warm-season, full-sun, well-drained growing conditions.
How to propagate
Few plants are kinder to grow more of than basil, whether you are opening a fresh seed packet or simply taking free copies from a plant already in your care.
SeedEasy
Sow indoors 6-8 weeks before last frost or direct sow after frost when soil is warm · Germinates in 5-10 days at about 70°F; transplant-ready in roughly 3-4 weeks
Seed is how most people get going, and it could not be friendlier for a beginner. Tuck each one a quarter inch down, 6 to 8 weeks before your last frost, and keep the mix cozy at 70°F (21°C) or warmer so the seeds come up well. Look for sprouts in 5 to 10 days and plants you can move on in about 3 to 4 weeks, or simply sow straight into the ground once it has warmed up.
Stem cuttingsEasy
Any time during the growing season from healthy non-flowering shoots · Roots form in water in about 1-2 weeks
Making more basil from cuttings is just about effortless, so do give it a try. Snip a 4-inch piece from a strong shoot that is not in flower at any point in the season, pull off the lower leaves, and pop the stem in a glass of water. Roots show in a week or two, and then you can pot up a brand new plant just like the one you started with.
Myths
After basil blooms, its leaves become poisonous and must be discarded.
You can keep eating basil even after it flowers, with no worry at all. The leaves simply turn a touch milder as the plant pours its strength into seed, and that is the real reason gardeners pinch the buds, not any sign the herb has spoiled.
Basil will only flourish with frequent, heavy feeding.
The opposite is true, and a gentle touch serves you far better here. Heavy feeding actually dilutes the oils that carry the flavor, so one or two light feeds across the whole season give you all you need.