Free DIY hydroponic system plans: build yours this weekend

Step-by-step build plans with shopping lists and honest costs. Every plan here is free, and every one of them costs under $50 to build.

Start with the $10 build
A workshop bench holding three hand-built hydroponic systems side by side: a glass jar Kratky garden, a black bucket unit with an air pump, and a length of white PVC pipe with net pots of greens.
Every plan here is built from parts you can buy locally, and none of them need special tools.
Start here

$10 mason jar Kratky

One plant, no pump, no electricity, 15 minutes. The cheapest possible way to prove to yourself that hydroponics works.

Grows: 1 plant · Cost: $8 to $15 · Power: none

Build it
Step 2

$30 bucket DWC

Four plants in one five-gallon bucket with an air pump. The natural upgrade once your first jar succeeds.

Grows: 4 plants · Cost: $28 to $45 · Power: air pump

Build it
Step 3

$50 PVC pipe system

Six to eight plants in a compact footprint. Your first recirculating build, and the one that looks impressive on a balcony.

Grows: 6 to 8 plants · Cost: $40 to $55 · Power: water pump

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Zero cost

Soda bottle garden

A Kratky system from a 2-litre bottle you were going to recycle. Bigger reservoir than a jar, and free.

Grows: 1 plant · Cost: $5 to $8 · Power: none

Build it

Which plan should you build first?

If you have never grown hydroponically, build the mason jar. It costs almost nothing, it takes 15 minutes, and it teaches you the one thing that matters most: that this actually works. Everything else is a scale-up of the same idea.

Build the $10 system