Growing Basil with Kratky Hydroponics
Kratky Hydroponic Basil
Nothing is more pleasing than growing basil in the house, all year long. With Kratky basil, you can do this in a jar on your windowsill.
Why it works
Basil & Kratky Method
Basil, a fragrant herb known for its culinary and medicinal properties, thrives when grown using the Kratky method. This passive hydroponic technique offers a soil-free, low-maintenance approach, ensuring a steady supply of fresh basil. Discover the benefits of this innovative method, including faster growth rates, reduced water usage, and the ability to cultivate basil year-round. That's why I simply love Kratky basil!
Basil is one of the best first plants for the Kratky method. It grows fast, it likes warmth and steady moisture at the roots, and you harvest it again and again from the same plant. One jar on a sunny sill gives a steady supply of leaves for cooking.
70°to 80°F
Fresh hydroponically grown basil
Hydroponic Basil for Caprese Salads
For basil to flourish, it requires a warm environment with temperatures between 70-80°F (21-27°C). Give your basil 6-8 hours of direct sun from a bright window, or 12-16 hours under a grow light. Maintain humidity levels around 40-60% to mimic its native Mediterranean climate. With these conditions, your basil will thrive, producing lush, aromatic leaves ready for harvest.
Warmth
70-80°F (21-27°C) keeps basil growing fast.
Bright light
A bright window or an LED grow light.
Humidity
Around 40-60%, like its Mediterranean home.
Feeding
Nutrient Requirements for Basil
When growing basil using the Kratky method, it's essential to provide a balanced nutrient solution to ensure healthy growth. A hydroponic nutrient mix with an N-P-K ratio of 4-1-3 is ideal. Ensure the solution includes essential micronutrients like calcium, magnesium, and iron. Maintain a nutrient concentration of 800-1200 ppm for optimal results. Regularly monitor and adjust the pH level to stay between 5.5 and 6.5 to facilitate nutrient uptake.
- N-P-K ratio around 4-1-3
- Calcium, magnesium and iron in the mix
- 800-1200 ppm nutrient concentration
- pH between 5.5 and 6.5
Getting started
How to Start Kratky Basil in a Jar
The same five steps work for a mason jar, a tub or a bucket.
Choose a dark jar
Wrap a mason jar or use an opaque tub so no light reaches the solution.
Mix the solution
Water plus a hydroponic nutrient for leafy herbs, at the strength on the label.
Plant the net pot
Set a basil seedling in a net pot so the base just touches the solution.
Give it light
Bright indirect sun or a grow light, as in the tips below.
Pinch and harvest
Pinch the tops at 6-8 inches and keep harvesting from the top.
Harvesting Basil Tips
Best Practices for Basil Harvesting
To harvest basil effectively, begin by pinching off the top leaves once the plant reaches 6-8 inches in height. This encourages bushier growth and prevents flowering, which can alter the flavor. Always use sharp scissors or pruning shears to avoid damaging the plant. Harvest in the morning when the essential oils are most concentrated for the best flavor. Regular harvesting promotes continuous growth, ensuring a steady supply of fresh basil leaves.
Cut just above a pair of leaves and two new shoots grow from that point. Our post on how to cultivate your herbs shows where to cut basil, chives and rosemary.
Care
Growing Tips for Basil
Successfully growing basil with the Kratky method involves maintaining stable environmental conditions. Under LED grow lights, give your basil 12-16 hours of light daily. Keep the temperature between 70-80°F for optimal growth. Watch for common issues like nutrient deficiencies or root rot, and address them promptly by adjusting your nutrient solution. Let the level fall as the basil drinks: the air gap that forms is what gives the upper roots oxygen, so no air pump is needed. If the container runs low before harvest, top it up only part way so the upper roots stay in the air.
FAQ
Kratky Basil Questions
Can I grow basil in a mason jar?
Yes. A mason jar is one of the easiest Kratky containers for basil. Cover the glass so light does not reach the nutrient solution, and set the basil in a net pot in the lid.
When can I start harvesting Kratky basil?
Begin pinching off the top leaves once the plant reaches 6-8 inches in height. Regular harvesting keeps the plant bushy and stops it from flowering.
Why should I pinch off basil flowers?
Flowering can alter the flavor of the leaves and signals the end of the plant's life cycle. Removing flower spikes keeps basil growing new leaves.
What pH does Kratky basil need?
Keep the nutrient solution between pH 5.5 and 6.5 so the basil can take up its nutrients.
Go deeper
More on Growing Basil
This page is the short version. Our sister site Kratky Basil covers basil in depth.
- Kratky Basil: the full guide to growing basil with the Kratky method
- Basil varieties: sweet, Thai, lemon and purple basil compared
- Pruning basil: where to cut so the plant branches
- Keeping hydroponic basil alive: what goes wrong and how to fix it
Related Kratky Herbs
Basil grows well beside other Kratky herbs. Parsley shares its light and warmth, and pruning keeps both producing.