How should I choose Xtreme Gardening CalCarb Foliar Booster?

Xtreme Gardening CalCarb Foliar Booster 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 Xtreme Gardening CalCarb Foliar Booster 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 Xtreme Gardening CalCarb Foliar Booster come in?

Xtreme Gardening CalCarb Foliar Booster is available in 2 options: 3 oz, 6 oz. Select your preferred size on the product page to see pricing and availability.

What is the return policy for Xtreme Gardening products?

Toledo Indoor Garden accepts free 30-day parcel returns on unused, unopened Xtreme Gardening 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.

Xtreme Gardening CalCarb Foliar Booster - Image 1

Xtreme Gardening CalCarb Foliar Booster

SKU: RTI2504

Size: 3 oz

$20.99

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

Xtreme Gardening CalCarb Foliar Booster 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.

Xtreme Gardening Cal Carb is a revolutionary calcium carbonate foliar spray derived from a naturally occurring compound, processed using nanotechnology to a particle size fine enough to permeate plant foliage.

When applied, Cal Carb rapidly converts from calcium carbonate (CaCO3) to calcium oxide (CaO) and carbon dioxide (CO2), raising CO2 levels around leaf stomata up to threefold — near the optimum for photosynthesis efficiency.

Calcium is critical to plant health, contributing to cell membrane strength and nutrient regulation.

Cal Carb delivers both calcium and a localized CO2 boost directly to leaves, enhancing photosynthesis and helping plants recover from stress by raising surface pH to deter airborne pathogens.

Application Rates: • Established Plants: 1 tsp per quart (1 tbsp per gallon) of water in sprayer; spray foliage focusing on undersides of leaves; repeat weekly • Fruiting & Flowering: 2 tsp per quart; spray focused "pop-shots" on undersides of outermost 6-12 leaves • Best applied alone — wait 36 hours before applying other foliar nutrients • Leaves a beneficial white calcium residue that may be rinsed after 36 hours (leaving it on achieves best results) Available in 3 oz and 6 oz sizes.

Compatible with all growing systems and media.

Weight: 0.25 lbs.

Dimensions: 5 x 5 x 10 in.