🌿 Herbs (General Growing Guide)

Various — see entry
The gateway drug of gardening — start with basil, wake up with forty pots.
Sun
Most culinary herbs want full sun (6+ hours); parsley, cilantro, and mint tolerate part shade
Days to harvest
Varies wildly: basil 30 days for leaves, woody perennials (rosemary, thyme) a full season to establish
Spacing
Varies by species — but the universal rule is: give them more room than the nursery pot suggests
Soil pH
6.0–7.5 for most; Mediterranean herbs tolerate up to 8.0

How to grow

Here's the secret the garden center won't tell you: most culinary herbs want to be treated a little bit mean. The Mediterranean crew — rosemary, thyme, oregano, sage, lavender — evolved in hot, dry, rocky hillsides. Rich, wet, heavily fertilized soil makes them grow fast, floppy, and bland, because the plant puts energy into leaves instead of the essential oils that carry flavor. Stress concentrates flavor. Your herbs should struggle just enough to taste amazing.

The soft annuals play by different rules: basil, cilantro, dill, and parsley want richer soil, steadier water, and will bolt, flower, or die at the drop of a hat. Cilantro bolts when a cloud passes overhead; basil sulks below 50°F. Grow these as succession crops — sow every 2–3 weeks — instead of expecting one planting to last all season.

Almost all herbs do brilliantly in containers, which is convenient because containers enforce the two things herbs want most: sharp drainage and contained roots. Mint especially belongs in a pot — planted in the ground, it spreads by underground runners and will own your yard within two seasons. This is not an exaggeration. Ask anyone.

Water & feeding

Water deeply but infrequently for Mediterranean perennials — let soil dry between waterings. Keep annuals (basil, parsley, cilantro) consistently moist; drought triggers bolting. Feed lightly: a spring top-dress of worm castings is plenty for perennials, while heavy-feeding basil appreciates a mid-season boost. When in doubt, underwater — overwatering kills more herbs than all other causes combined.

Common problems

  • Root rot from overwatering: the #1 herb killer across all species — ensure drainage, let soil dry, use unglazed pots.
  • Bolting (cilantro, dill, basil): heat and day length; succession-sow, provide afternoon shade, harvest aggressively.
  • Leggy, pale growth: not enough sun — most herbs need more light than a windowsill provides; supplement or move outside.
  • Mint escaping: always containerize mint. Always. No exceptions. Your future self says thanks.

Harvest

Harvest in the morning after dew dries, when essential oils peak. Never take more than a third of a perennial at once. Pinch basil's growing tips constantly to prevent flowering — flowers mean the flavor's about to decline. For drying: low and slow, dark and airy; or freeze soft herbs in oil in ice cube trays.

Nerdy fact: The flavor compounds in herbs — thymol, rosmarinic acid, eugenol — evolved as the plant's chemical warfare against insects, fungi, and grazing animals. Every time you season dinner, you're deploying a plant's immune system as a condiment. Delicious, delicious warfare.

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