Jack's Classic Houseplant Special 15-30-15 Fertilizer
Best reliable plant food for vibrant, healthy houseplants.
Jack's Classic Houseplant Special 15-30-15 is a synthetic fertilizer formulated with a 1-2-1 ratio, ideal for flowering and foliage houseplants. It ensures consistent nutrition for long-term plant health, preventing stress from over or underfeeding. This versatile fertilizer also serves as an effective transplant solution and a blossom booster for outdoor flowering plants. It is suitable for a variety of houseplants including Philodendron, Pothos, Ficus, and Spider Plants, as well as outdoor flowering varieties.
$17.95
Owner Satisfaction
4.6
/ 5
Category Rank
1939
/ 4425
#1939 in Fertilizers
Price vs Category Average
-71%
Below average
NPK Ratio
153015
/ --
Who it's for
- Houseplant owners seeking comprehensive nutrition for both green growth and flowering.
- Gardeners who want quick-acting fertilizer for immediate plant health improvements.
- Plant enthusiasts aiming to provide complete, well-rounded nutrition to their indoor collection.
Who should skip it
- Novice plant parents or those prone to over-applying fertilizer.
- Busy individuals preferring ready-to-use solutions over mixing powdered concentrates.
- Growers with only non-flowering foliage plants or those concerned about nutrient ratios.
Performance breakdown
Nutrient Density
High phosphorus content drives impressive bloom production and root development.
Solubility Speed
Dissolves rapidly in water for immediate, mess-free nutrient delivery.
Versatility
Seamlessly transitions from indoor foliage care to outdoor blossom boosting.
Application Ease
Simple constant-feed method eliminates guesswork for busy plant owners.
Transplant Efficacy
Reduces shock and promotes faster establishment for newly potted specimens.
Formula Stability
Consistent chemical balance prevents common nutrient burn and stress issues.
Key Specs
NPK Ratio
15-30-15
Package Weight
8 oz.
Fertilizer Form
Water Soluble
Intended Use
Indoor Plants, Roses, Trees and Shrubs
Application Method
Constant Feed, Transplant Solution
Target Plant Type
Houseplants, Flowers, Trees and Shrubs
Plant Type Application
Houseplants, Flowering Plants, Foliage Plants, Outdoor Flowering Plants
Features
- Ideal for flowering and foliage houseplants
- Provides consistent nutrition for long-term health
- Prevents nutrient stress from over or underfeeding
- Acts as a transplant solution
- Functions as a blossom booster for flowering plants
What customers say
Customers consistently praise this fertilizer for its remarkable effectiveness and ease of use. Many report significant improvements in plant health, including vibrant foliage and abundant blooms, often after just a few applications. Users appreciate its simple mixing instructions and the reliable results it delivers across a variety of houseplants. The consensus highlights its ability to revive struggling plants and maintain the vigor of healthy ones, making it a trusted choice for both novice and experienced plant enthusiasts seeking dependable performance.
Know before you buy
Yes, this formula is versatile enough for outdoor use. It works well as a blossom booster for outdoor flowering plants, as well as for trees and shrubs.
This product is designed for a 'constant feed' application method. You can use it regularly at a diluted rate to provide your plants with consistent, steady nutrition.
Yes, it is specifically formulated to act as a transplant solution. Using it when repotting helps reduce transplant shock and supports root establishment.
Absolutely. While the 15-30-15 ratio is excellent for encouraging blooms, it also provides the essential nutrients required for healthy foliage growth in common houseplants like Pothos, Philodendron, and Ficus.
This is a water-soluble fertilizer, meaning you must dissolve the powder in water before applying it to your plants. Always follow the mixing instructions on the label to ensure the correct concentration.
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