Can this be used on outdoor plants?

Yes it can but it depends on the needs of your plants. They also have a blossom booster and all purpose formula that I use outside.

What’s the difference between “all purpose” and “special”?

I would think that all purpose applies to all. And special meaning that it contains superb ingredients

Is there any differences between this jr peters houseplant special 15-30-15 and jr peters all-purpose 20-20-20?

15-30-15 is double the amount of phosphorus. It’s best to check on each plant to find out what fertilizer is suitable.

Should this be refrigerated when storing in a very humid environment?

I keep mine under kitchen sink and we love in Florida👍🏻

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15-30-15 Houseplant Special Water-Soluble Fertilizer, 8oz

Product ID: 7802070

Details

Brand
Jack's Classic
Item Form
Powder
Item Weight
8 ounces
Liquid Volume
0.24 liters
Specific Uses For Product
Houseplant

🌿15-30-15 NPK for lush growth

💧Water-soluble powder for max dilution

🧂Includes precise measuring spoon

¥8535

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌱 Feed your plants like a pro—vibrant growth, zero guesswork!

MICRONUTRIENT BOOST - Enhanced with essential micronutrients for all-around plant health
BURN SAFE APPLICATION - Highest safety factor prevents leaf burn when used as directed
DUAL FEEDING FLEXIBILITY - Use as foliar spray or root drench for targeted nourishment
BALANCED 15 30 15 FORMULA - Optimized nutrient ratio for vibrant foliage and abundant blooms
POWDERED CONCENTRATE EFFICIENCY - Mix once, feed multiple gallons—cost-effective and eco-friendly

Jack's Classic 15-30-15 Houseplant Special is an 8oz water-soluble powder fertilizer designed for vigorous green growth and enhanced flowering. Featuring a balanced NPK ratio and enriched micronutrients, it supports both foliar and root feeding with a convenient measuring spoon included. Trusted for safe, gradual nutrient release and versatile application, it’s a must-have for thriving indoor plants.

Specifications

ASIN	B00KSMQM0M
Application Method	Spray, Mix with water
Best Sellers Rank	#38,397 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #966 in Garden Fertilizers
Brand Name	Jack's Classic
Coverage	Medium
Customer Reviews	4.7 4.7 out of 5 stars (815)
Global Trade Identification Number	00671341515081
Included Components	only product
Item Form	Powder
Item Highlight	Powdered, Targeted Micronutrient Package, Promotes Green-up and Increased Blooms, Transplant Solution, Root & Foliar Feeding
Item Weight	8 ounces
Liquid Volume	0.24 liters
Manufacturer	JR Peters
Mixing Ratio	1 teaspoon per gallon of water
Model Number	51508
Number of Items	1
Number of Packs	1
Part Number	51508
Specific Uses For Product	Houseplant Care, Foliar Feeding, Root Feeding, Plant Growth, Flowering Plant Support
Target Species	Plant
UPC	671341515081
Unit Count	1 Count

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