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Jacks Classic All Purpose 20-20-20 - 8 oz
Jacks Classic All Purpose 20-20-20 - 8 oz
$10.40

  • Free shipping on orders over $99

  • Shop With Confidence. Over 175,000 Orders Shipped.

  • Detail
  • STORING MIX
  • CARE
  • REVIEWS

Product Highlights


  • For Use On All Indoor and Outdoor Plants
  • Feeds Growth Through Both the Leaves and Roots
  • Balanced Mix of Nitrogen, Phosphorus, and Potassium
  • Great as a General Purpose Fertilizer

From Jack's Classic:

Balanced Nitrogen, Phosphorus and Potassium for use on all indoor and outdoor plants. Feeds through both the roots and the leaves.

More professional growers have used this product for all their growing needs than any other formula. It is a balanced blend of Nitrogen, Phosphorus and Potassium with fully chelated trace elements that works on all plant materials as a general-purpose fertilizer. Indoors it is especially effective on foliage plants to keep leaves green and happy.

Storing Your Mix


Can unused mix or media be stored for later use? 
Absolutely yes! Because we make all of our mixes fresh, the container of mix or media you get will usually have some moisture in it. This is perfectly normal and is because we use water in the processing and preparing of many of the ingredients. It is necessary to dry out any mix or media before storage so it stays fresh. 

What is the best way to dry and store mix or media? 
We recommend removing the mix/media from the container it comes in and allowing it to get bone dry. This can be done on a cookie sheet or other suitable surface and may take a few days. Once dry, it can be placed back in the original container (box and/or bag) and stored in a cool dry location. Leave a small opening in the bag for air to get in and check periodically.

How long can stored mix/media last? 
Dry mix can be stored for many months or longer depending on the location it is in and how dry it is kept.

When I am ready to use the mix/media after it has been stored, what is the best way to get it ready? 
Uniformly moisten the mix/media by rinsing at the sink in a colander or similar container with drainage. It is not necessary to soak overnight. All our mixes and medias are already prepared for immediate use when received, but it is always best practice to uniformly rinse before using.

What if I see any kind of green algae or mildew form on the mix or media ( stored or in bag or in pots with plants)? 
Algae and other natural growth is not uncommon on growing media that is damp and that is exposed to sunlight especially. Normally this is not harmful to the plant as these elements are often present in a natural growth setting too. Rinsing with clean water can often be all that is needed to remove this and we recommend a regular monthly application of a mild solution of Physan 20 for this purpose as well (mix at a rate of 1 tsp per gallon). Keeping containers and mix/media clean and fresh is best as it reduces premature breakdown of material and allows more light to enter while helping us to see and monitor plant development at the root zone when using clear pots.

Read Care Articles

9 Simple Tips for African Violets

Here we cover some of the most common questions we get asked regarding African Violet Care.

How to Water African Violets

Did you know one of the most effective ways to water an African Violet is from the bottom up?

What is Root Rot?

Is your African Violet not bouncing back the way you would think? It's possible you need to check its roots.

Separating and Transplanting

After you've propagated your leaf, what should you do next? This guide reveals the answers to those questions.

Repotting Your African Violet

A helpful guide to walk you through your first African Violet repotting. Don't worry, it's easier than you think!

African Violet Repotting FAQ

Do you know how often you should repot your African Violet? The answer might surprise you!

Propagation By Leaf

In this tutorial, we cover how to create new African Violets from the healthy leaves currently growing on your plant

Climate and Temperature Guide

How hot or cold should my growing environment be? This and other climate related questions answered.

Fertilizing Your African Violet

A simply guide comprising of common questions and answers regarding the topic of fertilizing.

Leaf Colors Explained

Ever wondered why your leaves are turning brown, yellow, or some other color? We have your answers!

Light Requirements

We often get asked questions regarding light requirements for African Violets. We provide those answers here.

CUSTOMER REVIEWS

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WHY IS OUR MIX DIFFERENT?

~ Hidden Benefits ~

Hand-Blended Daily

Our family of mixes are all blended in small batches daily to ensure freshness.

No Chemicals or Fertilizers

Our products are 100% free of any chemicals or fertilizers. The difference in quality is breathtaking. 

Fantastic Drainage

Our soils/mixes are designed in a way to maximize drainage. This leads to healthier plants and less root rot.

Better Ingredients 

We source our ingredients from all over the globe. When you buy from us, you know you're getting quality.