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Plant nutrients and pest control that take the guesswork out of growing.
Humboldts Secret makes feeding and protecting plants simple, effective, and — dare we say — a little magical.
Easy-to-follow feeding system
Works with any plant, indoors or out.
Backed by thousands of 5-star reviews.
Increase yields by 568%.
No myths, just Humboldts Secret. See the proof on screen — in real-world tests, our plant nutrient system boosted yields by over 500%. Imagine what it could do for your garden.
Not sure where to start?
Every gardener’s initiation is different — here’s the simplest way in. Our Starter Kit gives you the tools to feed your plants exactly what they need, with less waste, less confusion, and more visible results.
- Comes with everything you need for a full growth cycle.
- Simple, beginner-friendly instructions (no pH math required).
- Works for indoor plants, patio pots, raised beds, small greenhouses, and backyard gardens.
“My plants turned around in a week. I’ve never had this kind of success with other products.”
You don’t need a greenhouse or an oracle to grow something great. Humboldts Secret makes it easy to feed your plants the nutrients they actually need. No second-guessing, no nutrient burn.
- Clear instructions and easy measuring.
- Safe for all plant types, from houseplants to herbs.
- Works in pots, raised beds, balconies, and beyond.
Before Humboldts Secret Supplies became a trusted name in plant nutrients, Yousef was just trying to solve a problem with his own plants: why were so many products failing to deliver the results they promised?
He started experimenting, testing different blends, and tracking what actually made plants thrive, and what didn’t. After countless refinements, he unlocked natural pest control and liquid plant food formulas that worked — a Secret worth sharing. Friends asked for them. Then customers. Now, over a million gardeners use Humboldts Secret.
And Yousef? He still leads the company today with the same philosophy it began with: give people the tools to grow well, without overcomplicating the process or cutting corners on quality.
Excellent customer service
Free shipping for orders over $99
6-Month Satisfaction Guarantee
Secrets worth sharing: Tips, how-tos, and growing smarter
Using these so far has been great. I’m really happy with the results and how well everything is working.