JACKS CLASSIC - ALL PURPOSE FERTILIZER - 20-20-20
Best versatile fertilizer for indoor and outdoor plant enthusiasts.
Jacks Classic All Purpose 20-20-20 fertilizer is a trusted choice for professional growers, serving as the industry standard for general-purpose feeding. This formula delivers essential nitrogen, phosphorus, and potassium to promote rapid green-up and robust leaf expansion. It effectively nourishes plants through both their roots and leaves, making it ideal for all indoor and outdoor plants. Indoors, it excels at maintaining the vibrant green color of foliage plants. For generations, it has been a proven performer in vegetable gardens, and can be combined with other Jack's Classic products for enhanced flowering and color.
$29.99
Owner Satisfaction
4.8
/ 5
Category Rank
1
/ 4425
Best Fertilizers
Price vs Category Average
-51%
Below average
NPK Ratio
202020
/ --
Who it's for
- Plant owners wanting to prevent common nutrient deficiency issues
- Gardeners needing one versatile solution for diverse plant collections
- Impatient growers seeking immediate visual results and rapid plant growth
Who should skip it
- Specialized growers targeting specific flowering or vegetative growth phases
- Busy hobbyists preferring a set-it-and-forget-it slow-release feeding schedule
- Beginners worried about accidentally damaging sensitive root systems
Performance breakdown
Nutrient Balance
The classic 20-20-20 ratio provides reliable, balanced support for diverse plant needs.
Foliage Vitality
Consistently delivers the nitrogen boost required for deep, lush green leaves.
Application Versatility
Works seamlessly across indoor houseplants, vegetable patches, and outdoor flower beds.
Absorption Efficiency
Dual-action formula allows for effective nutrient uptake through roots and leaves.
System Compatibility
Integrates easily into existing feeding schedules with other specialized fertilizer products.
Ease of Use
Granular form dissolves reliably for quick preparation and consistent feeding results.
Key Specs
NPK Ratio
20-20-20
Package Weight
8oz
Item Number
52008
Fertilizer Type
All Purpose Fertilizer
Fertilizer Form
Granular
Nitrogen Percentage
20%
Phosphorus Percentage
20%
Potassium Percentage
20%
Features
- Feeds through roots and leaves for comprehensive nourishment.
- Promotes fast green-up and rapid leaf expansion.
- Ideal for all indoor and outdoor plants.
- Keeps foliage plants looking lush and green.
- A proven performer in vegetable gardens.
- Can be used with other Jack's Classic products.
What customers say
Customers consistently praise Jacks Classic 20-20-20 for its exceptional quality and visible effectiveness. Gardeners report dramatic, rapid growth across various plants, from vegetables to ornamentals, often seeing results within days. The product is highly concentrated, meaning users find it offers excellent value for money because a small amount yields professional level results. Its water solubility makes application simple and reliable, cementing its status as a trusted, all purpose staple in serious gardening routines.
Know before you buy
Yes, this is a versatile, all-purpose formula designed to support a wide range of plants, including indoor foliage, outdoor flowers, and vegetable crops.
This formula is designed for dual-action feeding. It can be absorbed by the plant through both the root system and the leaves, providing comprehensive nourishment.
The 20-20-20 ratio indicates an equal balance of nitrogen, phosphorus, and potassium. This balanced profile promotes steady, overall growth, rapid green-up, and healthy leaf development.
Yes, it is compatible with other products in the Jack's Classic line. Many growers combine it with the Jack's Classic Blossom Booster to specifically enhance flowering and color production.
Because it is an all-season fertilizer, you can use it throughout the growing season. Always follow the specific dilution instructions on the packaging to ensure you are feeding your plants at the appropriate strength for their growth stage.
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$30