Price: $109.97
(as of Jul 21, 2026 16:46:09 UTC – Details)
From the brand
Simple Feeding, Better Gardens
Clear directions and consistent quality, no guesswork.
Trusted by Gardeners
Trusted by gardeners for over 10 years. Professional-grade plant nutrition, simple and consistent, from indoor plants to outdoor gardens.
Starter Kit & Essentials
Plant Food & Growth
Plant Care & Protection
Soil & Water Care
Outdoor Essentials
How did we get our start?
Humboldts Secret was created by gardeners, for gardeners, with a simple goal, make high-quality plant nutrients affordable and easy to use, so more people can grow with confidence.
What makes our products unique?
Humboldts Secret products are made with carefully selected ingredients and manufactured in our California facility, for consistent quality you can count on.
What problem are we solving?
We make plant nutrition simpler, clearer, and easier to follow, so gardeners can spend less time guessing and more time growing.
Packaging Update: You may receive previous or updated packaging during our transition. Same formula, same performance. Complete Nutrition From Seedling To Harvest – The Humboldts Secret starter kit includes six essential products to support plant health from start to finish: Base A & B (quart set), Flower Stacker (quart), CalMag & Iron (quart), Golden Tree (16 ounce), and Plant Enzymes (8 ounce). Whether you’re just starting or refining your routine, this complete system helps streamline feeding and encourage vigorous, full-cycle plant development with ease.
Balanced Feeding For Strong, Steady Growth: This concentrated liquid plant food mixes into 125 to 150 gallons of nutrient-rich solution for dependable plant care. Each formula delivers nitrogen, phosphorus, potassium, calcium, and magnesium to strengthen roots, support structure, and promote faster, more stable growth. Use across the full plant life cycle for consistent nutrition, noticeable results, and long-term health.
Made For Any Grow Medium Or Setup: Designed for versatility, these hydroponic nutrients work across hydro systems, potting soil, and coco coir. The blends mix easily, apply cleanly, and perform reliably in any environment. Whether you’re growing indoors or outdoors, in small containers or larger beds, this kit gives you control, flexibility, and measurable outcomes without complication.
Effortless Feeding For Indoor Plant Success: Feed houseplants, herbs, leafy greens, and flowers with this simple and effective indoor plant food liquid. It supports root health, vibrant color, and leaf strength with minimal effort required. Ideal for use in grow tents, shelf gardens, or windowsill pots, this formula helps maintain steady indoor plant growth while saving time and simplifying daily care.
Reliable Support Through Every Growth Phase: This plant fertilizer liquid fits seamlessly into your daily grow routine and supports plants during both vegetative and flowering stages. Whether you’re tending a few potted plants or managing a larger setup, it delivers consistent nutrition from week to week and helps maintain long-term plant strength, balance, and development without added complexity.
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