How to Grow Basil Indoors Hydroponically (Step by Step)

Basil is the perfect first hydroponic plant: fast, fragrant, and almost impossible to kill. Here's exactly how to grow more basil than you can use — year-round.

The setup

You can grow basil in any beginner system. We recommend the AeroGarden Harvest for absolute beginners or a Kratky mason jar for a no-electricity option.

Step 1 — Germinate

Drop 2–3 Genovese basil seeds into a rockwool cube or peat pod. Keep moist and warm (70–75°F). You'll see green sprouts in 5–7 days.

Step 2 — Transplant

Once roots poke through the cube, transfer to your hydroponic system. Thin to the single strongest seedling per pod.

Step 3 — Lighting

Basil loves light: 14–16 hours per day of full-spectrum LED. Keep the light 4–6 inches above the canopy.

Step 4 — Nutrients & pH

Mix nutrients at half strength for the first two weeks, then full strength. Target pH 5.5–6.5. A $15 pH kit pays for itself in one healthy harvest.

Step 5 — Pinch early, pinch often

This is the secret to bushy basil. As soon as your plant has 4 sets of leaves, pinch the top set off above a leaf node. The plant will branch in two. Do this every week and you'll have a bush, not a stalk.

Step 6 — Harvest

First leaves at week 3, real harvest at week 4. Always cut from the top. Never strip leaves from the bottom — the plant will sulk.

Beyond Genovese

Once you've nailed Genovese, try Thai basil for stir-fries, lemon basil for tea, or purple Dark Opal for stunning pesto.

Frequently asked questions

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