Hydroponic Nutrients for DWC, NFT & Drip

Hydroponic Nutrients

4.4 · 220 reviews

In a hydroponic system the nutrient solution is the plant's main source of nutrition, so what goes into the reservoir matters more than in a pot. Our liquid Hydroponic Nutrients are made for countertop pod gardens and soilless setups growing herbs, greens and fruiting plants, with separate leafy and fruiting schedules on the bottle.

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What growers are saying

“A nice addition to my plant care routine! 🌿 I recently started using TPS Hydroponic Nutrients for my Hoya collection growing in mineral substrate. I like that this fertilizer is specifically designed for soilless growing and provides essential nutrients for plant development. The instructions are clear, and a small amount goes a long way. It’s still early to see the full results, but I’m excited to continue using it!”
Kateryna C. · Verified buyer · Oct 14, 2026

“Loving this plant food so far! I have a Dryades hydroponic system with 66 pods I just set up on a Sunday. By that Wednesday, I started seeing sprouting in a few of them. The very next day, almost half the seeds I planted now have healthy, adorable baby seedlings already, including pac choy, broccoli, lettuce, basil, chard, kale, and cucumbers! Very excited to see what the following weeks bring!”
Nichole T. · Verified buyer · Oct 1, 2026

When to feed your hydroponic plants

When you're preparing fresh nutrient solution for newly established lettuce or herb roots in your hydroponic system

When your leafy greens are growing rapidly and it's time to replenish the solution according to the label

When your hydroponic tomatoes or other fruiting crops enter a stage with different nutrient and reservoir-monitoring demands

When testing shows that your reservoir has insufficient nutrients and the solution needs a measured adjustment or replacement

Check pH, EC, light, oxygenation, and root condition before adding extra fertilizer. Don't add concentrate solely because the water level dropped; follow the label and measure the solution.

Results you can see

Feeds foliage for deeper color and a brighter, more lively look.

Encourages fresh leaf and stem growth for a fuller, thriving plant.

Supports healthy, resilient roots that absorb nutrients more effectively.

How to use

Hydroponic systems

5 mL (1 tsp) per quart of feedwater

Leafy plants: every 2 weeks; Fruiting plants: weekly
Seed pod systems

5 mL (1 tsp) per 3 standard growing pods, at the start and again as needed

As needed

What's inside

The 4-3-6 ratio is balanced and led by potassium, built for soilless growing where your plant draws everything directly from the water — there's no soil to store nutrients or buffer mistakes, so the feed has to be complete on its own. The 4% nitrogen supports leafy growth, the 3% phosphate backs roots and fruiting, and the 6% potash drives fruit quality and overall vigor. The nitrogen is split between nitrate, absorbed directly for a fast response, and a smaller ammoniacal and urea fraction for steadier feeding.

Beyond NPK: sea kelp (Ascophyllum nodosum) for natural growth compounds, plus 1.0% calcium and 0.5% magnesium and a full micronutrient package — iron, sulfur, manganese, zinc, boron, and copper. Micronutrients matter more in hydroponics than in soil, because a soilless plant has no reserve to fall back on: iron keeps new growth from yellowing, and calcium and magnesium prevent the tip-burn and interveinal yellowing that appear quickly in water culture. Keeping the reservoir near pH 5.0-6.0 is what lets your plant actually take all of this up.

Frequently asked questions

How often should I feed my hydroponic plants?

Hydroponic Nutrients is a complete 4-3-6 feed, so it goes in on a regular cadence rather than as an occasional top-up. Add 5 mL, about 1 teaspoon, per quart of feedwater: every 2 weeks for leafy plants, weekly for fruiting plants, which draw more. In seed-pod systems, add 5 mL for every 3 growing pods at the start and again as needed. Warm conditions and fast growth use nutrients faster, so check the reservoir regularly and top up on schedule rather than letting it run low.

What pH should my hydroponic reservoir be?

Aim for pH 5.0–6.0. That’s the range where the nutrients in Hydroponic Nutrients stay available to roots in water culture; drift above or below it and your plant can’t take up certain elements even though they’re present in the reservoir, which shows up as deficiency symptoms despite regular feeding. Check with a meter or test kit and adjust with pH up or down as needed. In hydroponics, pH management matters as much as the dose itself.

Why are my hydroponic plants yellowing even though I'm feeding them?

In water culture, yellowing despite feeding is very often a pH problem rather than a shortage. If the reservoir has drifted out of the 5.0–6.0 range, roots can’t absorb the iron, calcium and magnesium that Hydroponic Nutrients supplies, and new growth pales even with nutrients right there in the water. Check and correct pH first. It can also mean the reservoir has run low or the solution is old and needs refreshing. A soilless plant has no reserve to draw on, so problems show fast and need quicker correction.

Can I use this in a Kratky or countertop seed-pod garden?

Yes. Hydroponic Nutrients is designed for both. For Kratky and other standard hydroponic setups, use 5 mL per quart of feedwater. For seed-pod countertop gardens, add 5 mL per 3 pods at the start and again as needed. Kratky is passive, with no pump to circulate the solution, so mix the nutrients in well when you set up. In either system, watch the water level and pH, because small reservoirs change concentration quickly as your plants drink them down.

When will I see results?

Quickly, when nutrients and pH are in range. With no soil to buffer the root zone, hydroponic plants respond to conditions right away, and leafy greens fed with Hydroponic Nutrients typically show visible new growth within days to a couple of weeks. The same speed runs the other way, so consistent feeding and steady pH are what keep growth even. Fruiting crops such as tomatoes and peppers follow their own cycle, flowering and setting fruit over the following weeks with the potassium-forward formula supporting that stage.