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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🌿 Feed your plants like a pro—grow green, grow strong!

PRECISION FEEDING - Comes with a free measuring spoon for exact, mess-free application every time.
BURN PROOF FORMULA - Engineered with the highest safety margin to protect your green friends from nutrient burn.
MICRONUTRIENT BOOST - Enhanced micronutrient blend promotes robust roots and vibrant foliage.
EFFORTLESS PLANT CARE - Simple, safe directions make nurturing your indoor jungle a breeze.
SUSTAINED GROWTH POWERHOUSE - Feeds your houseplants gradually for up to 4 months of lush vitality.

JR Peters Jack's Classic 15-30-15 Houseplant Special Fertilizer is an 8-ounce, slow-release nutrient formula designed to nourish houseplants for up to 4 months. It features an enhanced micronutrient package for strong roots and lush foliage, includes a free measuring spoon for precise application, and offers the highest safety factor to prevent burning when used as directed.

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