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One 1–2 gallon unglazed pot per 2–3 ft of bed
15 – 30 minutes setup

Olla Clay Pot Irrigation

Unglazed clay pots buried in the soil slowly release water to plant roots through their porous walls, cutting watering frequency in half.

Estimated time

15 – 30 minutes

Lifespan

Indefinite for the pot; silicone seal may need refresh every few years

Soil needed

None — buried in existing bed

Weight empty

2–5 lbs per pot

Weight full

10–20 lbs per pot when full

Best for

Tomatoes, peppers, squash, and any bed that dries out fast

Placement

Bury 1–2 gallon pots 2–3 ft apart in the root zone. Keep the lid exposed so you can refill easily.

Cutaway view of an unglazed clay olla buried in soil with roots growing toward its porous walls
Water seeps through the porous clay; roots grow toward the moisture
Top-down view of an olla opening covered by a matching clay lid to reduce evaporation
Keep the lid on to cut evaporation and keep mosquitoes out
A terracotta olla buried between tomato and pepper plants in a garden bed
Ollas work best for deep-rooted crops like tomatoes, peppers, and squash

Parts to Buy

PartQuantityWhat You Use Them For
Unglazed terracotta pots with matching saucers, 1–2 gallon1 per 2–3 ft of bedWater reservoir
Silicone sealant (food-safe)Small tubeSeals the drainage hole
Plastic lid or saucer1 per potCovers opening to reduce evaporation
  • ·Optional: small rock to weight the lid

Steps

  1. 1Seal the drainage hole in the bottom of each pot with silicone sealant. Let it cure fully.
  2. 2Dig a hole deep enough to bury the pot up to its rim.
  3. 3Set the pot in the hole and backfill firmly around it.
  4. 4Leave the pot opening above soil level.
  5. 5Fill the pot with water and cover the opening with a lid or inverted saucer.
  6. 6Plant crops around the pot within 12–18 inches.
  7. 7Water new transplants from above for the first week while roots find the wet clay, and keep the olla full.
  8. 8Refill whenever it is empty — usually every 2–4 days, and every 1–3 days in peak heat.
  9. 9In fall, empty the pots, scrub them, and store dry before freezing weather.

Tools needed

  • ·Caulking gun
  • ·Shovel or trowel
  • ·Damp cloth for cleanup

Common mistakes to avoid

  • ·Using glazed or sealed pots — water cannot seep through the walls
  • ·Burying the pot completely — you need access to the opening
  • ·Waiting to fill the olla until roots reach it; fill it at planting and water new transplants from above for the first week
  • ·Forgetting to refill for days in peak heat
  • ·Leaving the lid off — evaporation and mosquitoes move in fast

Maintenance tips

Refill every 1–3 days in peak heat. Scrub algae from the inside each season. Empty and store pots dry before hard freezes.

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