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JR Peters
Jack's Professional 20-20-20 General Purpose Fertilizer
JR Peters

Jack's Professional 20-20-20 General Purpose Fertilizer

3.9(60 ratings)

Best price now

$56.25at BetterGrow HydroObserved at 9:54 PM

28% under what the other stores charge

Compared across 6 stores. Prices are checked against each store and labelled with when.

Visit BetterGrow Hydro

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Our take on the Jack's Professional 20-20-20 General Purpose Fertilizer

Jack's Professional 20-20-20 is a water-soluble, balanced granular fertilizer from JR Peters for outdoor plants, garden centers and growing facilities. It dissolves for continuous liquid feeding and includes a tracer dye so you can see the mix. The 25 lb bag makes roughly 200 gallons of feed at the standard 1 tbsp per gallon rate. At $56.25 at BetterGrow Hydro as of November 6, 2026, it sits at the low end of its recent range across 6 stores.

Best forGarden centers and greenhouse growersHobbyists feeding many outdoor plantsLiquid feed programs through drip or watering canFast green-up on established plants
Pros
  • Balanced 20-20-20 works across most outdoor plants
  • Dissolves cleanly for continuous liquid feeding
  • Tracer dye shows the mix is uniform
  • 25 lb bag covers about 200 gallons of feed
  • Low cost per gallon compared with liquid bottles
Cons
  • High nitrogen rate can burn seedlings and sensitive plants
  • Not OMRI listed despite organic-based ingredients
  • Large bag is overkill for a few houseplants
  • Needs weighing and mixing; not a shake-and-pour product
  • Some buyers report clumping or hardened powder in the bag

Jack's Professional 20-20-20 General Purpose Fertilizer prices at every store

  • BetterGrow HydroNew

    In stock

    $56.25Observed at 9:54 PM
    Visit BetterGrow Hydro
  • Evolve Garden SupplyNew

    In stock

    $60.25Observed at 9:54 PM
    Visit Evolve Garden Supply
  • Grow Green MINew

    In stock

    $61.26Observed at 9:54 PM
    Visit Grow Green MI
  • WalmartNew

    In stockSold by Esbenshades Garden Center

    $78.30Observed at 9:54 PM
    Visit Walmart
  • eBayNew

    Availability unknownSold by esbenshadesgardencenter (99.9% positive, 92,200 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $78.30Free shippingVerified
    Visit eBay
  • WilcoNew

    Availability unknown

    $89.99Observed at 9:54 PM
    Visit Wilco

Also available at

  • eBayCheck price at eBay
  • Esbenshade's Garden CenterCheck price at Esbenshade's Garden Center
  • Garden ElementsCheck price at Garden Elements
  • Garden Supply GuysCheck price at Garden Supply Guys

Store links may earn us a commission.

Jack's Professional 20-20-20 General Purpose Fertilizer price history

Lowest price we've seen: $56.25 on Nov 7 at BetterGrow Hydro. Tracked across 10 stores since Nov 7.

What reviewers say

  • 3.9 / 560 ratings

Ratings average 3.9 out of 5 from 60 ratings. Growers like the balanced formula and the dye that confirms a full dissolve, but some complain about clumping and about burning tender plants when mixed too strong.

What people mention
  • DissolvingPraisedOwners say it dissolves cleanly in warm water and leaves little residue in tanks.
  • Tracer dyePraisedThe blue dye lets growers confirm the mix is fully dissolved and evenly blended.
  • ClumpingCriticisedSome buyers report the powder clumping or hardening, making it hard to scoop and weigh.
  • StrengthMixedGrowers like the fast green-up, but some say full-strength mixes burn seedlings and tender plants.
  • ValuePraisedThe 25 lb bag makes many gallons of feed, which owners call cheap per use.

Specifications

Type
General-Purpose Fertilizer
Primary Use
Maintaining plants, Fertilizer, General-Purpose
Use
Maintaining plants in garden center and growing facilities
Soil Type
Heavily acidic formulation
Form
Granules
NPK Ratio
20-20-20
Quantity
25 Lb

Questions and answers

How much water does the 25 lb bag make?
At the common 1 tablespoon per gallon rate, a 25 lb bag makes roughly 200 gallons of feed. Stronger rates for heavy feeders use it faster.
Is Jack's 20-20-20 safe for seedlings?
Use it diluted, about a quarter to half strength, on seedlings and young transplants. Full-strength mixes are high in nitrogen and can burn tender roots.
Is it organic or OMRI listed?
No. It is described as organic-based, but it is not OMRI certified, so it does not qualify for certified organic production.
Can I use it on houseplants?
Yes, at a diluted rate during active growth. The 25 lb bag is far more than a few houseplants need, so smaller sizes suit indoor growers better.
How does it compare with Jack's 20-20-20 Classic?
This is the general-purpose 20-20-20 in a 25 lb bag with tracer dye. Check the label lot for the exact formula, since JR Peters sells several 20-20-20 blends.
When is the price lowest?
Prices vary by store and season. The best new price was $56.25 at BetterGrow Hydro as of November 6, 2026, across 6 stores.
Where is the Jack's Professional 20-20-20 General Purpose Fertilizer cheapest?
At BetterGrow Hydro, for $56.25, 28% under what the other stores charge, as of our latest check.
What do buyers say about the Jack's Professional 20-20-20 General Purpose Fertilizer?
Rated 3.9 out of 5 from 60 ratings.
Where can I buy the Jack's Professional 20-20-20 General Purpose Fertilizer?
9 stores we checked sell it, including eBay, BetterGrow Hydro, Evolve Garden Supply, Grow Green MI, Walmart.

Stores we've priced the Jack's Professional 20-20-20 General Purpose Fertilizer at

  • Walmart deals and prices
Size
25 lbs
Active Ingredients
Potassium, Ammonium nitrogen, Phosphorus, Urea nitrogen
Ingredients
Potassium, Ammonium nitrogen, Phosphorus, Urea nitrogen
Organic
Organic Based
Eco-Friendly Certifications
No (OMRI certified)
Item Weight
25 LB
Dimensions
1 x 1 x 1 inches
Effect Highlights
Fast green-up
Effect Speed
Fast green-up
Container Size
25 Lb
Container Type
Bag
Packaging Size
25LB
Packaging Type
Bag
Application Method
Continuous Liquid Feed Program
Included Materials
Tracer dye
Suitable Application Site
Growing facilities, Garden center
Suitable Plant Type
All outdoor grown plants