Best Hydroponic Nutrients & Additives of 2025

“I bought this product in the spring to help my seeds grow. A little goes a long way and it works really well. The odor is quite strong, so mixing it outdoors or in a well-ventilated area is recommended. Thankfully, the smell dissipates after a few minutes. My plants really loved it, and I would definitely recommend this product.”

“This is my favorite beneficial bacteria product! It has a horrible smell, like rotten eggs, but after diluting it, it's not that bad. I think it outperforms other brands because they focus more on marketing than on product quality. I challenge anyone to compare it to GH and Botanicare; it’s a clear winner.”

“My plants have responded incredibly well to this product! They went from small and sickly to beautiful and massive in just a month. Sure, the smell is bad, but I just mix it in the bathroom with a window open, and I’m done in a few minutes. If your plants need a boost, you won’t regret using this.”

"I switched from Fox Farm to this and didn't expect such a difference. Turns out, I was mistaken! This is amazing stuff for fast growth and great looking buds!"

"I love these Flora series nutrients by General Hydroponics. They helped my indoor plants grow big and beautiful. The feeding chart is simple to follow, and I get insane growth and foliage when I use them right!"

"I've been using this product for a few years now, not just for cannabis. It's a reliable product that works well every time. I only need 12-20mL per 2 gallons of water, and it’s been effective across various plants."

"I've been achieving crazy yields with these nutrients. Hydroponics have given me the best results, though I might need to add more potash during flowering. But for vegetating, they really grow my plants fast and big!"

"I absolutely love this product! It's easy to use and it works like a charm in my garden."

"These nutrients are the best I’ve used over the years. I switched to another brand for a grow and immediately noticed a considerable difference. I can always count on this brand for consistent results."

"I find this booster liquid for hydroponics very easy to use and it seems to work well. While I can't compare its effectiveness to other fertilizers, my peppers thrived using the 'pepper/tomato' setting in my water garden. I just add it to the water and forget about it. The bottle size is also quite good."

"So far, my experience with this fertilizer has been positive. I added it to my hydroponic lotus seeds, and while I’m unsure if it’s truly helping yet, I do see one leaf sprouting and some other stems looking promising. I’m open to any tips for growing lotus flowers!"

"I've been using this concentrated fertilizer for my hydroponic herbs and lettuce, and it’s been effective. I emphasize not to overdose—less is definitely more. It’s crucial to follow the guidelines for the specific veggies I’m growing. My plants look vibrant and healthy, which is a great sign!"

"I've found this product to be incredibly easy to use and adjust as needed. My plants are thriving!"

"Using VIVOSUN Nutrients Base A & B has led to great results for my plants. Base A promotes strong growth and Base B aids in flowering and root development. My plants have never looked healthier!"

"I got this A and B hydroponic plant food as a refill for my garden systems. It works just as well as the original but lasts much longer. It's amazing to see how much everything grows in such a short time!"

"I've been using this product for almost 20 years and have never had any problems. It's really good stuff!"

"Initially, I was hesitant about the price, but my wife insisted that the plants love it, so I went for it."

"After struggling with my hydroponic plants, a friend recommended the Flora series. I'm so glad I switched! My plants are thriving, and I'm ready to harvest. The instructions are simple and easy to follow!"

"I received the product quickly and am excited to see how it performs during harvest. Definitely planning to order again!"

"It's still early to say for sure, but it seems like this will be a much-needed additive for my plants so far."

“I found it simple to mix the dry ingredients with distilled water. The gauge on the bottles makes it easy to dispense the right amount, and with refill packs included, I feel secure knowing I have a supply on hand.”

“As a beginner in hydroponics, I’m learning a lot. I took a gamble on this product because my garden came with an A + B system, and I noticed I had more luck with that than with pricier sets. I’m not sure what’s in this fertilizer, but so far, my greens are thriving! The instructions help with measuring, preventing over-saturation.”

“This fertilizer has completely changed the game for my seedlings and scions. I’ve successfully grown everything from peas to maple saplings, and I can see a difference in how quickly they thrive. The included measuring cup makes it easy to get the right amount every time.”

"I've been using General Hydroponics CALiMAGic in my hydroponic system, and it has made a noticeable difference in the health of my plants. This concentrated blend of calcium and magnesium is essential for preventing issues like blossom end rot and tip burn, especially in my tomatoes and peppers. The product mixes well and dissolves easily, making it simple to integrate into my nutrient regimen. I’ve seen fewer deficiencies and healthier growth since I started using it."

"After using General Hydroponics CALiMAGic for the past few months, it has made a noticeable difference in the health and growth of my plants. If you're experiencing calcium or magnesium deficiencies, this product is a lifesaver. Effective at preventing nutrient deficiencies: After incorporating CALiMAGic, I saw immediate improvement in leaf quality."

"I've done a ton of research when deciding my cocktail of nutrient water for my mostly tropical plants. I just use half a dose in my water and use it weekly! The plants have thrived since I started giving them my special water mix! Just some advice, if you're investing in your plants, consider getting a pH meter and PPM meter."

“I really love this stuff, especially when used with Humboldts Own nutrient system. The hydrozyme has allowed me to safely increase the PPM without burning tips.”

“Since I started using Deep Breath, all my previous plant issues have disappeared, and they are growing just as well as the others.”

“I noticed that all my plants finished previously are looking like they will be more potent this time and they smell much better.”