Emerald Harvest Cal-Mag - 1 Gal

Description

Keep your plants productive and green with Cal-Mag, a calcium and magnesium supplement from Emerald Harvest®. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield. This is especially important when growing in some media, such as coco coir, but any garden can benefit. Use Cal-Mag as a supplement to a base nutrient series for guaranteed professional results.

Emerald Harvest Cal-Mag - 1 Gal

Product form

Keep your plants productive and green with Cal-Mag, a calcium and magnesium supplement from Emerald Harvest®. Containing top-quality ingredients, Cal-Mag... Read more

Out of stock, 1-3 weeks

$70.00  $56.00

    • Guaranteed secure & safe checkout.

      shop pay
    • Free pickup at our Webster & Milford stores
    • 30-day returns on unopened items

    Description

    Keep your plants productive and green with Cal-Mag, a calcium and magnesium supplement from Emerald Harvest®. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield. This is especially important when growing in some media, such as coco coir, but any garden can benefit. Use Cal-Mag as a supplement to a base nutrient series for guaranteed professional results.

    Returns & Delivery

    How fast will my order ship?

    We're a small family-owned shop, not Amazon. Most orders arrive within 7–14 days, and some items ship direct from the manufacturer. Need it today? Pick it up at Webster or Milford.

    Can I pick this up in store?

    Yes — order online and collect at Webster or Milford with no shipping charge. Both stores are open seven days a week.

    What if I need to return it?

    Most new, unopened items can come back within 30 days of delivery for a full refund. If the mistake was ours, we cover the return shipping.

    Do you handle bulk and commercial orders?

    We ship pallets of Pro-Mix, Bio365 and Athena nationwide. Call 508-461-5850 or ask us for facility pricing.

    Shop related collections

    Recently viewed products

      © 2026 Matt’s Hydroponics, Powered by Shopify