EarthBox Gardening: DIY Self-Watering Container System Build & Grow Guide

The EarthBox is a sub-irrigated planter (SIP) with a built-in water reservoir, fertilizer strip, and mulch cover. Commercial version: $50–70. DIY version: $10–20 from storage totes. Same principle, huge water savings, foolproof for beginners. Here's how to build and grow in an EarthBox system.

How EarthBox / SIP Works

1. Container divided: upper soil chamber, lower water reservoir.
2. Screen/platform separates them with air gap.
3. Wicking medium (wet soil) connects chambers through holes in screen.
4. Fill tube adds water to reservoir.
5. Overflow hole prevents flooding.
6. Fertilizer band on top = season-long feed.
7. Mulch cover = zero evaporation, zero weeds.
8. Roots drink on demand. Self-regulating.

DIY EarthBox from Storage Tote (18–27 Gal)

Materials

• Storage tote + lid (opaque, sturdy: Rubbermaid, Sterilite)
• PVC pipe: 1" (fill tube), ½" (overflow), 4–6" (aeration screen support)
• Plastic mesh/grid: aeration screen (light diffuser panel, crate grid, hardware cloth)
• Landscape fabric (wrap screen supports)
• Black plastic bag / tote lid cut = mulch cover
• Bungee cords / zip ties (secure cover)
• Drill, hole saws (1", ½", 4–6"), zip ties

Build Steps

1. Determine reservoir depth (3–4"). Mark on tote interior.
2. Cut aeration screen to fit tote. Drill ½" holes every 2" (wicking).
3. Create supports: 4–6" PVC pieces (4–6 per tote). Wrap with landscape fabric. Zip-tie to screen.
4. Drill overflow hole at reservoir level (½"). Insert ½" PVC elbow.
5. Drill fill tube hole in lid (1"). Insert 1" PVC, angled bottom.
6. Place screen on supports in tote. Level.
7. Fill wetting chamber: pack wet potting mix into screen holes.
8. Fill soil chamber to ½ full. Pat firm.
9. Lay fertilizer band: 2 cups granular organic (5-5-5) in 2" strip across center. Don't mix.
10. Fill to top. Pat firm.
11. Cut X's in mulch cover at plant spacing. Secure cover (bungees).
12. Plant through X's. Water once from top. Then fill reservoir via tube.

Commercial EarthBox Specs

• 29" × 14" × 11" (2.5 cu ft soil, 3 gal reservoir).
• Holds: 2 tomatoes, 4 peppers, 8 bush beans, 16 lettuce, 8 cucumbers.
• Casters optional. Staking system available.

Growing in EarthBox / SIP

• Soil mix: Peat/coir based, NO compost (too heavy, clogs wicking). Pro-Mix, Fafard, or 1:1 peat:perlite + lime.
• Water: Fill reservoir via tube until overflow. Check weekly. Never top-water after establishment.
• Fertilizer: One band at planting lasts season. Don't add more.
• Sun: 6–8 hrs. Casters help follow sun.
• Support: Install cages/stakes at planting (through cover X's).

Best Crops for EarthBox

• Excellent: Tomatoes, peppers, eggplant, cucumbers, beans, peas.
• Great: Lettuce, greens, herbs, strawberries, flowers.
• Challenging: Root crops (carrots, potatoes—reservoir depth limits), large vines (pumpkin).

Maintenance & Troubleshooting

• Salt buildup: Flush annually (remove cover, top-water heavily, drain reservoir).
• Algae in reservoir: Opaque tote prevents. If clear, paint black.
• Root rot: Overflow working? Screen not saturated? Reduce water.
• Fertilizer burn: Band too concentrated? Use 2 cups max, don't mix.

Why SIPs Win for Beginners

• Impossible to overwater (overflow protects).
• Impossible to underwater (reservoir buffer).
• No daily watering chore.
• Fertilizer math done once.
• Weed-free (mulch cover).

EarthBox/SIP technology solves the #1 container killer: water management. Build one from a $15 tote, or buy the refined commercial version. Either way, you get a self-regulating growing machine that produces more food with less work.