How should I choose NPK Industries Stack Supplement?

NPK Industries Stack Supplement should be matched to your growing media, water source, crop stage, feeding style, and pH/EC monitoring plan. Choose the exact size or variant before adding to cart. This page has 2 purchasable options, and price, stock, weight, and dimensions can change by size.

Can NPK Industries Stack Supplement ship in the United States?

Toledo Indoor Garden ships eligible products within the United States. Available shipping options, rates, and estimated delivery timing are calculated during checkout from the selected cart and destination address.

What sizes does NPK Industries Stack Supplement come in?

NPK Industries Stack Supplement is available in 2 options: 8oz, 16oz. Select your preferred size on the product page to see pricing and availability.

What is the return policy for NPK Industries products?

Toledo Indoor Garden accepts free 30-day parcel returns on unused, unopened NPK Industries products in original packaging after return authorization. Freight, LTL, oversized, special-order, or commercial items may require customer-paid return freight unless the item arrived damaged or defective.

NPK Industries Stack Supplement

SKU: NPK241

Size: 8oz

$98.99

Available to Order

Inventory may be in-store or supplier warehouse. Call 419-725-2450 to confirm availability, handling timing, or shipping.

Questions? Call 419-725-2450

Quick answer

NPK Industries Stack Supplement should be matched to your growing media, water source, crop stage, feeding style, and pH/EC monitoring plan.

Best fitGrowers building a nutrient program around a specific media type, water source, and crop stage.

Check before orderingChoose the exact size or variant before adding to cart. This page has 2 purchasable options, and price, stock, weight, and dimensions can change by size.

Grower tipStart from the label or feed chart, measure pH and EC, and increase strength only after plants show they are handling it.

Shopping guidance from Toledo Indoor Garden. Prices, availability, shipping rates, weights, and dimensions are verified during checkout.

NPK Stack is a flowering supplement from NPK Industries that works with all nutrient and feeding programs to promote early and consistent fruit and flower development.

Applied weekly as a foliar spray starting at the transition to bloom and continuing through weeks four and five, it delivers precise influencers that trigger natural plant reproductive functions.

Stack helps plants optimize their shift from vegetative growth to flowering, maximizing genetic potential during the critical bloom stage.

It is part of NPK Industries' Gold Series Technology line for growers seeking enhanced flowering and fruiting.

Weight: 0.75 lbs.

Dimensions: 10 x 7 x 4 in.

Available sizes: 8oz, 16oz.