Buying guide
Kratky Potato Supplies
Kratky potato supplies are simple: a dark container with a lid, a basket of loose medium, seed potatoes, a complete hydroponic nutrient and a way to check pH. Nothing needs a plug. This buying guide goes through each item, what to look for, and what you can skip.
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The short list
- Container and lid: deep, opaque and food-safe.
- Net pot or basket: deep enough to hold several inches of medium.
- Growing medium: perlite, coco coir or a mix.
- Seed potatoes: certified, from an early variety for your first try.
- Hydroponic nutrient: a complete formula for vegetables.
- pH test kit or pen, and pH down: to keep the solution slightly acidic.
- Measuring tools: a jug, measuring spoons or a small kitchen scale.
- Light: full sun outdoors, or a full-spectrum LED grow light indoors.
- Optional: an EC or TDS meter, foil tape for light leaks, and a hole saw for cutting the lid.
Container and lid
The container decides how much solution the plant has and how much room the tubers get, so it matters more for potatoes than for lettuce. Look for a deep, opaque container made of food-safe plastic, with a lid stiff enough to hold the basket. A 5-gallon bucket suits one early variety. A deep storage tote holds more solution and suits a bigger, later variety. Our guide to the best containers for Kratky potatoes compares the options and shows how to block light leaks.
Net pot or basket
In a Kratky lettuce setup the net pot is small, because it only holds a seedling. For potatoes, the basket is where the tubers form, so deeper is better. Net pots are sold by the width of the top, and you cut a hole in the lid to match. Choose the deepest basket that fits your container, and leave room above the seed potato to keep adding medium as the stems grow.
Growing medium
Perlite is light and drains well. Choose a coarse grade, rinse it before use, and wear a dust mask when pouring dry perlite, because the fine dust irritates the lungs. Coco coir holds more moisture and stays dark. It's usually sold as a compressed brick that expands when soaked. Choose a buffered coir, because unbuffered coir can hold on to calcium and magnesium the plant needs. Many growers mix the two; see perlite vs coco coir for potatoes.
Seed potatoes
Buy certified seed potatoes, which are inspected for disease and aren't treated to stop sprouting. An early variety such as Yukon Gold or Red Norland is the easiest first crop. See where to buy seed potatoes for what to check when they arrive.
Nutrient and pH
Use a complete hydroponic nutrient labeled for vegetables, not a soil fertilizer. Our guide to nutrients for Kratky potatoes explains the types and how to mix them. For pH, liquid drop kits are cheap and reliable, while pH pens are quicker but need calibrating with buffer solution and storing in their storage solution. Tap water is often slightly alkaline, so pH down gets used far more than pH up.
Light
Outdoors, potatoes need full sun. Indoors, a full-spectrum LED grow light works, and an outlet timer keeps the hours steady without you having to remember. The light is for the leaves only: the container and basket must stay dark.
What you can skip
The Kratky method needs no air pump, air stone, water pump or pump timer, so leave those out of the basket. Be careful with hydroponic kits sold online, too. Many are designed for leafy greens and herbs, and they're too shallow to leave room for tubers. A plain bucket or tote with a deep basket does the job better.
Before you buy
Check that everything fits together: the basket fits the lid, the lid fits the container, and the container fits the space you have in full sun or under the light. Then follow how to grow potatoes without soil to set it up.
Questions about Kratky potato supplies
Are hydroponic kits good for growing potatoes?
Usually not. Many kits are designed for leafy greens and herbs and are too shallow to leave room for tubers. A plain bucket or tote with a deep basket does the job better.
What is the cheapest way to start?
A food-safe bucket with a lid, a net pot, a bag of perlite, a few certified seed potatoes, a hydroponic nutrient and a pH drop kit. Everything else is optional.
Is an EC meter necessary?
No, but it helps in hot weather, when the solution can get stronger as the plant drinks. A reading tells you when to top up with a weaker mix.
Can I reuse my supplies next season?
The container, lid and net pot can be cleaned and reused. Many growers rinse and reuse perlite, while coco coir breaks down with use and is usually replaced.
Related Kratky potato guides
More on growing potatoes with the Kratky method, from the first sprout to the harvest.