Soil & Hydroponic Plant Nutrients has the largest selection of specialty plant fertilizers and nutrients for your hydroponic system, soil containers or outdoor grows.

Each macro and micro nutrient is important for optimal plant growth and necessary to maximize yield! We have nutrient packages that provide a complete and balanced nutrition plan during the entire growth cycle as well as specialty micro nutrient plant fertilizers that can help you boost your plants health. Whether you need a rooting compound for cloning and seed propagation, cal-mag supplement, bat guano or bloom booster - has you covered. Check out our extensive line of organic nutrients too! Don't forget to stock up on measuring and mixing cups for a precise measurement of your nutrient solution. also has a huge selection of soil & hydroponic meters including pH adjusters, calibration solutions and nutrient & pH dosers.

Most Popular Hydroponic Nutrient Lines

Buy any container size of any product from our most popular nutrient lines!

Most Popular Soil Nutrient Lines

Buy any container size of any product from our most popular nutrient lines!

Nutrients Certified For Use
In Organic Gardens

Grow Room Nutrients, Fertilizers, & Supplements

The Basics of Plant Nutrition

There are two main types of nutrient solutions: Vegetation or ‘Grow’ and Flowering or ‘Bloom’ nutrients. These solutions will have a different ratio of usually the same mix of macro and micronutrients. You will give plants different ratios of mainly the primary macronutrients during different phases of its life cycle. The three primary macronutrients are nitrogen, phosphorus, and potassium.

As well as the two main nutrient solutions types, there are also two non-essential nutrient solutions that are always a good idea to have lying around: a potassium silicate booster and a calcium-magnesium booster.

Many growers will give a potassium silicate booster throughout the plant’s life, even when growing in soil as the available potassium in soil is in very small amounts. A cal-mag solution is good to have around because calcium and magnesium deficiencies occur more frequently compared to micronutrients such as zinc, manganese, boron, etc. Some growers consider a cal-mag solution a must for inert soilless mediums and treat their soilless media with it before planting. Calcium, magnesium, along with sulfur are known as the three secondary macronutrients.

Most companies provide feeding schedules along with their solutions. As well you can find more in-depth versions online. This will be a good starting place, and it’s often advised to start at ¼ or ½ the recommended amount. You can always give more, so watch for deficiencies.

Furthermore, some plants will require more nutrients than others, and different growth phases require more or less. The latter is important to be aware of because you will not always keep increasing your nutrients the older the plant becomes. Often, you will bring your nutrient levels down in late flowering. In fact, many growers see their plants needing the most nutrients during the pre-flowering stage when the plant rapidly increasing its height within a very short time (1-2 weeks).

Last, seedlings will not need nutrients as their starter leaves (cotyledon) provide them with all the nutrients they usually need.

How to read nutrient solution labels – NPK ratio

The three primary macronutrients that you give your plants and the percentage they make up in a nutrient solution is called the NPK ratio or value. This stands for the percentage of nitrogen, phosphorus, and potassium in the bottle/solution. You will see a series of numbers (0-0-0) on the label that will show you that nutrient solution’s NPK value.

Nitrogen – This nutrient will be in the highest amount in nutrient solutions designed for the vegetative state. Promotes chlorophyll production, vegetative growth, and healthy foliage.

Phosphorus – This nutrient will be in the highest amount in nutrient solutions designed for the flowering stage. Promotes the development of flowers, DNA/RNA synthesis, and strong roots.

Potassium – The percentage of potassium in nutrient solutions usually stays the same for all growth stages. However, some growers supply extra potassium, known as potassium silicate, because it’s a natural fungicide and will build a plant’s defense against insects and fungi. It will also create stronger stems which is good for holding the heavy weight late in flowering, and it can help fight heat stress even when temperatures are over 100° F.

Choosing the best NPK ratio

Companies will provide different NPK ratios they feel are best for specific growing stages and many professional growers have their own preferred ratio. New growers do not need to worry about this, however.

Eventually, you may want to mix nutrients, but for now, stick to the ratio the nutrient bottle gives you. Just make sure your nutrient solution is high in nitrogen and low in phosphorus for the vegetative stage, and low in nitrogen and high in phosphorus for flowering.

Most likely, you’ll want to look into mixing nutrients solutions when your plants are in the pre-flowering stage. High phosphorus is good for promoting a successful transition, but flowering nutrients are often too low in nitrogen, and it’s common to see leaves yellowing at the bottom of the plants. This is fine as long as the yellowing stays at the bottom, but some growers are uncomfortable with any yellowing.

You can find companies that sell nutrient solutions designed for the pre-flowering stage specific needs, which is great for beginners who are uncomfortable creating their own mix but want to avoid yellowing.  

pH and PPM (Parts Per Million)

When watering your plants, whether with nutrients or not, you have to make sure the water is within the correct pH range. Nutrients will not be available for absorption unless it’s within a set pH range that’s dictated by your grow media. This is why it’s important to purchase a pH tester and pH adjustment solutions, commonly known as “pH up” and “pH down”.

Soil’s pH range is different than soilless and hydro mediums.

  • Soil’s pH is range 6.0-7.0
  • Soilless and hydro’s pH range is 5.5-6.5

PPM tells you how much “stuff” or minerals there are in your water. Pure water will be 0 ppm, but tap water will have a much higher number. Many growers use ppm as their unit of measurement when giving nutrients to their plants. They will use a ppm meter to test the water going in and the water draining out – or in the case of hydroponics testing the water in the reservoir – and compare the two numbers to judge whether they should give their plants nutrients or not.

It’s important to calculate how much nutrients you are giving your plant because if you give too little you will cause deficiencies which may lead to stunted growth and even plant death. Many growers give too much and this can burn the plants or cause nutrient lockout where one nutrient is blocking another from being absorbed.

Setting Your Grow Room Up For Success

Hydrobuilder is your one-stop shop for all things nutrients. We offer both organic and synthetic nutrients from top brands, supplements and additives to give your plants a major boost, and measuring and testing supplies that will make sure you’re always giving your plants the proper amount of nutrients.

Nutrient Packages – Eliminate the headache associated with figuring out which nutrients you need and when with our complete nutrient packages. For each of the packages, we let you choose the size and quantity of the various bottles. Like five out of six of the bottles in a package? No problem just remove it. Need a bigger bottle of flowering nutrients since you use more flowering nutrients than nutrients for the vegetative stage then no sweat.

Soil and Soilless Mix Nutrients – Here you can find the best nutrients for growing in soil and soilless mediums such as coco coir.

Hydroponic System Nutrients – When growing in a hydroponic system, the nutrients are more easily absorbed and available, and this can mean fantastic plants whose growth and development is unrivaled. But it also means that you can more easily overdo it and give too much. That’s why we offer hydroponic nutrients from the top dogs who design their nutrients solutions with hydro in mind.

Compost Tea – Increase plant growth, provide beneficial organisms, replace toxic chemicals, and suppress diseases with compost tea. Compost tea is a liquid fertilizer that is created by soaking compost in water which then can be applied in multiple ways. We offer the ingredients to make your own, as well as pre-brewed teas that are ready to use of out the box.


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