Jack's Nutrients 7-15-30 Finish Fertilizer | 25lb

Low-Nitrogen Finishing Fertilizer, 7-15-30, 25lb

Finishing a crop strong takes a different nutrient balance than growing it out. Jack's Nutrients 7-15-30 Finish Fertilizer promotes strong finished plants with low nitrogen, high phosphorus, and high potassium content, built to keep the whole plant healthy to the end of its crop cycle.

25lb size, 7-15-30 low-nitrogen finishing formula.

Key Features & Benefits

• 7-15-30 low-nitrogen, high-potassium ratio — keeps the whole plant strong to the end of its crop cycle.
• Promotes strong finished plants — built specifically for the late-cycle finishing stage rather than early growth.
• Part of the CEA-focused Jack's Nutrients lineup — sized for greenhouse and indoor controlled-environment production.
• Water-soluble formula — mixes cleanly into an existing feeding program for the crop's final stretch.

Who Should Use Jack's Nutrients Finish Fertilizer

This fits greenhouse and controlled environment growers approaching the end of a crop cycle who want a low-nitrogen, high-potassium formula to finish plants strong.

About the Jack's Nutrients CEA Line

Jack's Nutrients is JR Peters' hydroponic and Controlled Environment Agriculture sub-line, with the Finish formula specifically balanced for the late-stage nutrient needs of a crop nearing the end of its cycle.

Frequently Asked Questions

When during the crop cycle should this formula be used?

This formula is designed to promote strong finished plants, so it's best used toward the end of the crop cycle rather than during early vegetative growth. The low nitrogen, high phosphorus, and high potassium content is specifically balanced for that late-stage finishing period.

Why does a finishing formula need low nitrogen?

Low nitrogen at this stage helps avoid pushing continued vegetative growth when the goal is to keep the whole plant healthy and strong through the end of its cycle rather than encouraging new leafy growth. The higher phosphorus and potassium levels take over that late-stage support role instead.

What growing environments is this formula suited for?

Growers finishing a crop in a greenhouse or indoor controlled-environment setting are the primary audience, consistent with the rest of JR Peters' Jack's Nutrients CEA-focused lineup. It isn't marketed for open-field production.

What size is this listing?

This is the 25lb size option. Both sizes share the same 7-15-30 finishing formula, so the choice comes down to how much product a grower needs on hand.