Frequently Asked Questions

An olla (pronounced "oy-ya") is an unglazed terracotta clay vessel used for sub-surface irrigation. Originating over 4,000 years ago, ollas are buried in soil next to plant roots. Water inside the vessel slowly seeps through the porous clay walls directly into the root zone, delivering moisture on demand. Azen Garden ollas are a modern, pot-friendly version of this ancient technology.

Most plastic or glass watering globes rely purely on gravity and a small neck opening to drip water. They can flood soil when it's already wet or empty too fast. Azen Garden ollas use osmotic pressure through porous terracotta. Water only moves when the surrounding soil is dry enough to pull it through. This means your plant literally controls how much water it receives, preventing both overwatering and underwatering.

Azen Garden ollas are ideal for planters 8 inches (20cm) or larger. The globe measures 6.3" tall × 3.0" wide, so it needs enough soil depth to sit properly with roots surrounding it. Smaller pots may not give the olla enough soil contact to work effectively. For very large raised beds or garden patches, you may want to use multiple ollas spaced throughout the bed.

Step 1: Soak the globe in clean water for 30 minutes before first use. This primes the clay pores and improves initial water flow.

Step 2: Push the globe gently into the soil of your planter, near the base of your plant where roots concentrate. Bury it until only the neck sticks above soil level.

Step 3: Fill through the cork top using a small funnel or squeeze bottle. Replace the cork.

Step 4: Check and refill every few days at first until you establish a rhythm for your specific plant and environment.

It varies by plant type, pot size, soil mix, and climate. Most users find they refill every 3–7 days indoors and every 1–3 days in hot, sunny outdoor conditions. In summer heat or for thirsty plants like tomatoes, you may refill more frequently. In winter or for drought-tolerant succulents, the globe may last 1–2 weeks between fills. Start by checking every 2 days and adjust from there.

Yes, Azen Garden ollas work beautifully with both. Indoors, they're excellent for houseplants like pothos, monstera, ferns, and herbs. Outdoors, they're perfect for raised planters, container vegetables, and flowering plants. The key is that the planter should be at least 8" across to give the globe enough soil contact.

Most non-succulent plants thrive with olla watering. Top performers include:

• Vegetables: tomatoes, peppers, cucumbers, squash, herbs
• Houseplants: pothos, monstera, peace lily, fiddle-leaf fig, ferns
• Flowers: geraniums, lavender, impatiens, hydrangeas
• Fruit: strawberries, dwarf citrus, blueberries (in containers)

Succulents and cacti are not ideal since they prefer periods of complete dryness, which ollas prevent.

Yes, significantly. Fungus gnats lay eggs in wet soil surface. Because olla watering keeps the top layer of soil dry while the root zone stays moist, the surface conditions gnats need to breed simply don't exist. Most olla users report a dramatic drop in fungus gnat populations within 1–2 watering cycles. Similarly, weed seeds on the surface need surface moisture to germinate, so keeping that layer dry suppresses weed growth naturally.

After removing from soil, rinse the outside with warm water to remove loose soil. If mineral deposits (white crust) build up over time, soak in a solution of 1 part white vinegar to 4 parts water for 2–3 hours, then scrub gently with a soft brush. Rinse thoroughly and allow to air dry completely before storing. Do not use soap or chemical cleaners as they can clog the pores and affect water flow.

Yes. The glaze on Azen Garden ollas is completely non-toxic and food-safe. It contains no lead, heavy metals, or harmful chemicals, making our ollas safe to use alongside herbs, vegetables, fruits, and any other edible plants. You can water your garden with full confidence.

Azen Garden ollas are available on Amazon with Prime shipping, easy returns, and Amazon's standard buyer protection. Each set includes 4 ollas with cork stoppers and a wooden display stand.