Ideas to recycle plastic bottles to make a beautiful automatic watering hanging garden

What you see in the photo is a clever reuse of clear **plastic PET bottles** turned into a hanging self-watering planter: a lower bottle holds soil and flowering plants while an upper bottle functions as a **water reservoir**. This simple recycled setup uses **capillary action** (a wick or small hole through the cap) to deliver a slow, steady supply of water to the root zone—perfect for trailing annuals and compact flowering plants.

Why this bottle-reservoir trick works (botanical basis)

A steady, moderate supply of moisture keeps roots active without the boom-and-bust of over- and underwatering. Many flowering annuals respond to consistent soil moisture with better bloom retention and less stress-related leaf drop. The reservoir-plus-wick method provides controlled delivery via **capillary action**, while a well-aerated potting mix prevents oxygen-starved roots and reduces risk of root rot. Treat this as a helpful complement to good light, drainage and feeding—not a miracle cure.

Materials and exact proportions

• Plastic bottles: two food-grade PET bottles (1.5–2 L works best).
• Soil mix for each 2 L planter: 600 ml quality potting mix + 300 ml coconut coir (or peat) + 300 ml perlite or pumice (ratio 60:20:20 by volume).
• Wick: 10–15 cm of cotton rope, 6–8 mm diameter (or use a 4–6 mm cotton shoelace).
• Drainage: small hand drill or awl to make 4–6 holes (3–5 mm) in base of planter.
• Fertilizer: water-soluble balanced fertilizer diluted to 1/4 of the manufacturer’s recommended concentration for reservoir feedings (see schedule below).
• Tools: craft knife, scissors, waterproof tape, optional spray paint or UV tape to shade reservoir.

Step-by-step assembly

• Clean bottles: wash with warm water and mild soap; rinse thoroughly. This removes residues and reduces risk of pathogens.
• Prepare the planter (bottom bottle): cut off the top 1/3 of the bottle to create the planting bowl. Poke 4–6 drainage holes (3–5 mm) in the base to prevent pooled water if the bottle gets overfilled.
• Make the reservoir cap/wick: drill or pierce a single centered hole (6–8 mm) in the cap of the top bottle. Thread the cotton wick through the cap so 10–12 cm protrudes into the soil when assembled and 4–6 cm remains in the reservoir. Seal around the wick with waterproof tape so it sits snugly.
• Assemble reservoir: fill the top bottle with water (or water + diluted fertilizer) and screw the wick-fitted cap on. Invert this bottle and place the neck into the neck of the planter or into a small hole cut in the planter’s rim so the wick reaches the soil.
• Fill with soil and plant: add the prepared soil mix (60:20:20) into the planter, firm lightly, make a planting hole and set your young plant or plug in place. Finish filling so the wick is embedded in the root zone.
• Finish and hang: add a simple hanger (wire, macramé cord or strong string) around the bottle neck or taped to the top bottle, and hang where the plant gets its required light.

Watering, feeding and maintenance schedule (precise)

• Reservoir refill: in mild weather, check and refill every 2–3 weeks; in hot summer conditions refill every 1–2 weeks. Mark a calendar reminder—do not rely solely on visual cues.
• Fertilizer dosing: use a balanced water-soluble fertilizer at 1/4 of the label’s recommended strength in the reservoir. Example: if label says 1 teaspoon per gallon, dissolve 1/4 teaspoon per gallon. Apply this diluted fertilizer through the reservoir every 3 weeks during the main growing season (spring–summer). Reduce to every 6 weeks in autumn and stop or use a very dilute maintenance feed in winter for cool climates.
• Wick replacement: replace the cotton wick every 3–6 months or sooner if it compresses or shows mold.
• Soil refresh: replace or top-up the potting mix annually to restore structure and nutrients.

Practical tips from real gardeners

• Choose the right plants: trailing annuals, compact bedding flowers and some herbs adapt best to this system. Avoid deep-rooted vegetables.
• Use a light, open mix: the 60:20:20 mix drains yet retains enough water for the wick to be effective—too-fine mixes clog the wick and too-heavy mixes suffocate roots.
• Shade the reservoir: wrap the visible reservoir in cloth, paint it with light-blocking paint, or use an opaque bottle to avoid algae growth and reduce UV breakdown of the plastic.
• Secure hanging points: the system gets heavy when full—use strong hooks, hardware and tie-offs rated for at least twice the total weight (water + soil + plant).
• Test before hanging: set the assembled unit on a tray to ensure no leaks and that the wick supplies moisture steadily for 24–48 hours before installing in final position.

Common mistakes and how to avoid them

• Too-big wick or hole: a large opening or oversized wick causes waterlogging and root rot. Use the recommended wick thickness (6–8 mm) and a snug cap seal.
• No drainage: skipping drainage holes invites stagnant water and anaerobic conditions. Even self-watering units need base drainage.
• Dense soil: using only garden soil or heavy potting soil blocks capillary flow—stick to the specified airy mix.
• Ignoring light/humidity needs: this system won’t fix poor light or pest problems—place plants where their light requirements are met and check regularly for pests.
• Leaving bottles in extreme heat: avoid placing filled PET reservoirs in uncontrolled hot environments for long periods to limit plastic degradation and overheating of roots.

Conclusion — make it your own and start small

Recycling PET bottles into hanging self-watering planters is a low-cost, effective way to keep flowering plants happily watered and decorative. Follow the simple assembly steps, use the precise soil and feeding ratios, and maintain a refill schedule (every 1–3 weeks depending on season). Start with one planter to master the wick and soil balance, then scale up to create a lush, flowing hanging garden that’s both beautiful and low-maintenance. Try it this season and share a photo of your recycled hanging garden when it’s thriving!