You are here

Mississippi State Trial Garden Potting Soil Recipe

Publication Number: P3409
View as PDF: P3409.pdf

A potted plant with many pink flowers.

Basic Large Container Mix

Ingredients

15 gallons composted fine pine bark (soil conditioner)

5 gallons sphagnum peat or peat-based bagged potting soil

3 cups controlled-release fertilizer (e.g., Osmocote, Nutricote)

1½ cups dolomitic lime (garden lime)

½ cup micronutrient fertilizer (e.g., Micromax)

water

wetting agent (optional)

Directions

  1. Break up clumps of sphagnum peat if using compressed bales.
  2. Combine pine bark and sphagnum peat. If using a powdered wetting agent, add it now.
  3. Add a small amount of water—just enough to reduce dust during mixing. If using a liquid wetting agent, add it to this water.
  4. Blend the pine bark and sphagnum peat until the mix looks uniform.
  5. Add fertilizer, lime, and micronutrients and mix until well blended (no clumps).
  6. Add water slowly while mixing until the mix is moist but not wet.
  7. Transfer the mix to your container, and shake the pot to settle. Avoid packing or tamping the mix.
  8. Plant your selected plants into the container.
  9. Top-dress the pot with the appropriate amount of fertilizer for the plants.
  10. Water in your new transplants very well, but slowly. You want to water until water begins draining from the holes in the bottom of the pot.
  11. If saving leftover potting mix, read the comments to learn about the steps to use it later.

Comments

  • This mix is intended for large containers. Pots larger than 6 inches are what we consider large.
  • If the controlled-release fertilizer you select has micronutrients included, you will not need the additional micronutrient fertilizer.
  • Other fertilizers can be used, but the amounts will need to be adjusted to deliver an equivalent amount of nutrients. ONLY slow- or controlled-release fertilizer should be used.
  • The fertilizer in this recipe is only a starting amount. You will need additional fertilizer to ensure optimal plant growth.
  • If you are growing plants that are acid lovers, reduce the amount of lime by half (add only ¾ cup).
  • If you save extra mix for later, keep it in a dry location. Make sure to water in very well immediately after planting. Water until the water runs clear from the holes in the bottom of the pot. This will prevent salt damage. Water as normal from then on.

Mississippi State Trial Gardens logo.


The information given here is for educational purposes only. References to commercial products, trade names, or suppliers are made with the understanding that no endorsement is implied and that no discrimination against other products or suppliers is intended.

Publication 3409 (POD-01-20)

By Geoffrey Denny, PhD, Assistant Extension Professor, Plant and Soil Sciences.

Copyright 2020 by Mississippi State University. All rights reserved. This publication may be copied and distributed without alteration for nonprofit educational purposes provided that credit is given to the Mississippi State University Extension Service.

Produced by Agricultural Communications.

Mississippi State University is an equal opportunity institution. Discrimination in university employment, programs, or activities based on race, color, ethnicity, sex, pregnancy, religion, national origin, disability, age, sexual orientation, genetic information, status as a U.S. veteran, or any other status protected by applicable law is prohibited. Questions about equal opportunity programs or compliance should be directed to the Office of Compliance and Integrity, 56 Morgan Avenue, P.O. 6044, Mississippi State, MS 39762, (662) 325-5839.

Extension Service of Mississippi State University, cooperating with U.S. Department of Agriculture. Published in furtherance of Acts of Congress, May 8 and June 30, 1914. GARY B. JACKSON, Director

The Mississippi State University Extension Service is working to ensure all web content is accessible to all users. If you need assistance accessing any of our content, please email the webteam or call 662-325-2262.

Select Your County Office

Your Extension Experts

Portrait of Dr. Gary R. Bachman
Extension/Research Professor
Ornamental Horticulture Host of Southern Gardening
Portrait of Dr. Shaun Robert Broderick
Asst Extension/Research Prof
Ornamental Horticulture
Portrait of Dr. James Dewey McCurdy
Assistant Professor
Turfgrass Extension Specialist/Weed Scientist/Weed Control-Turf and Ornamentals
Portrait of Dr. Rick Snyder
Extension/Research Professor
Greenhouse Tomatoes and other vegetables, Field Vegetables, Mushrooms

Related Publications

Publication Number: IS0871
Publication Number: P2948
Publication Number: P2443
Publication Number: P3210

Pages