Plan · field guide
How Much Space Herbs Actually Need
Herbs get planned like vegetables and they should not be. A basil plant and an oregano plant take similar room on day one and then go in completely different directions, because one dies at frost and the other is still there in four years getting wider. Here is the spacing, the pot size, and the split that makes herb planning simple.
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Split them into annuals and perennials first
Every herb planning question gets easier once you sort by lifespan, because the two groups need opposite things.
Annual herbs live one season and you want a lot of them at once. Basil, cilantro, and dill are in this group. You plant them close, cut them hard, resow them through the season, and pull everything at frost. Cilantro in particular bolts in heat and is finished in about 3 weeks of useful picking, so a single sowing is never enough.
Perennial herbs live for years and get wider every one of them. Oregano, thyme, sage, rosemary, mint, and chives are here. Spacing them for their first-year size is the standard mistake, because a thyme plant that looks lost at 12 inches will fill that space by its second summer and crowd its neighbor by its third.
So: annuals get tight spacing and repeat sowings. Perennials get their mature spacing on day one and a permanent spot outside the beds you turn over each spring.
Spacing, herb by herb
These are the in-row spacings the planner uses. The second number is the room between rows if you are growing an herb in a bed rather than a pot.
- Basil: 8 inches apart, 18 inches between rows. Annual, about 60 days, picks for 12 weeks.
- Cilantro: 4 inches apart, 12 inches between rows. Annual, about 50 days, only about 3 weeks of picking before it bolts.
- Dill: 12 inches apart, 18 inches between rows. Annual, about 40 days.
- Parsley: 6 inches apart, 12 inches between rows. Grown as an annual, about 75 days, but picks for around 16 weeks.
- Chives: 6 inches apart, 12 inches between rows. Perennial, picks for about 18 weeks a year.
- Oregano: 12 inches apart, 18 inches between rows. Perennial, picks for about 16 weeks.
- Thyme: 12 inches apart, 12 inches between rows. Perennial, picks for about 20 weeks.
- Sage: 18 inches apart, 24 inches between rows. Perennial, and it gets genuinely shrubby.
- Mint: 18 inches apart. Perennial, and it must be contained.
- Rosemary: 24 inches apart, 24 inches between rows. Perennial, the largest herb here.
Herbs in pots: match the pot to the root, not the leaf
Most herbs are grown in containers, and most container herb failures are a pot that is too small rather than anything the gardener did wrong.
Use the in-row spacing above as the minimum pot diameter for a single plant. A basil plant spaced at 8 inches wants a pot at least 8 inches across. A rosemary spaced at 24 inches will be unhappy in anything under a large tub, which is why supermarket rosemary in a 4 inch pot dies within weeks no matter what you do.
Depth matters as much as width. Shallow herbs like thyme and oregano are fine in 6 inches of soil. Basil, parsley, and dill want 8 to 10 inches, because parsley and dill both put down a taproot and will stall if they hit the bottom of a shallow pot.
The practical test is watering frequency. If a potted herb needs water twice a day in summer, the pot is too small for the plant. That is the signal to move up a size, not to water more.
Do not plant mint in the bed
Mint spreads by underground runners and it does not respect the spacing above or anything else. Planted in an open bed it will be through the neighboring rows within a season and coming up in the lawn within two.
Grow it in a pot, standing on a hard surface rather than on soil, because runners will find their way out of a drainage hole and root into the ground underneath. A pot sunk into a bed is only a partial fix for the same reason.
This is the one herb where the rule is absolute. Everything else on the list can share a bed sensibly.
Plant a lot less than you think, except for basil
Herb quantities run opposite to vegetables. Most herbs are a garnish, so one plant covers a household.
One rosemary, one sage, one thyme, and one oregano plant will out-produce what a normal kitchen uses, and by year three they will be producing far more than that. People plant six oregano because they are small in the pot, and then spend years with an oregano hedge.
The exceptions are the herbs you use by the handful rather than the sprig. Basil is the main one, because pesto uses a shocking volume, and a plant only gives about half a pound across the season. If you want pesto more than once, plant several. Cilantro is the other, because each sowing gives you about 3 weeks and then bolts, so getting cilantro all summer means sowing a short row every 2 to 3 weeks rather than planting more at once.
The test: think about the last time you ran out of an herb mid-recipe. If it has never happened for sage, one plant is right. If it happens with basil every August, that is the one to multiply.
Keep going
Questions, answered straight
Basil is spaced 8 inches apart, so roughly two plants fit in a square foot. For pesto in quantity plan on several plants, since one gives only about half a pound of leaf across the season.
Both go 12 inches apart. They look far too spread out in the first season and then fill it completely by the second, which is why spacing them at their first-year size crowds the bed later.
Use the in-row spacing as the minimum pot width: about 8 inches across for basil, 12 for oregano and thyme, 24 for rosemary. Give basil, parsley, and dill 8 to 10 inches of depth because they root deeply. If a potted herb needs watering twice a day in summer, the pot is too small.
Because that is what cilantro does in heat. A sowing gives roughly 3 weeks of picking before it flowers, and no amount of trimming stops it. The fix is sowing a short row every 2 to 3 weeks rather than trying to keep one planting going.
No. Mint spreads by underground runners and will run through neighboring rows in a season. Keep it in its own pot standing on a hard surface, since runners escape through drainage holes and root into soil underneath.
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