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Top Isotonix Deals for October 2025

The biggest price drops from Isotonix over the past 30 days. Use the available coupon codes at checkout for even more savings.

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Gro-fine 39 Lb. 15,000 Sq. Ft. 30-0-4 Lawn Fertili...

Crabgrass preventer plus lawn food. Controls crabgrass as pre-emergent or early post-emergent to extend application window. Provides quick, deep, even greening. Non-staining formula uniformly covers to deliver an invisible barrier at soil surface that prevents crabgrass from germinating while feeding the lawn. Contains Dimension herbicide, providing a 4-month preventative barrier against crabgrass, many broadleaf weeds, and other annual grassy weeds. Also contains SURFCOTE Sustained Uniform Release Fertilizer to continuously provide nutrients to the lawn.
$115.99
$85.6626% OFF

Espoma Organic 4 Lb. 4-3-4 Holly-tone Dry Plant Fo...

Especially formulated for acid-loving plants like hollies, azaleas, dogwood, evergreens, rhododendrons, laurels, and raspberries. Contains all 15 nutrients essential for beautiful healthy plants. Long-lasting natural organics breaks down slowly for continuous feeding. Improves soil condition for better aeration and moisture retention. Won't burn or leach out of the soil. Ready-to-use. Analysis: 4-3-4. USDA United States Department of Agriculture Certified Organic.
$26.99
$21.0722% OFF

Scotts Turf Builder WinterGuard 43.3 Lb. 12,000 Sq...

Treat weeds and feed your lawn with Scotts Turf Builder WinterGuard Fall Weed & Feed 3 in the fall for a better lawn next spring. This weed killer plus lawn fertilizer controls over 50 listed lawn weeds, including clover, dandelion, plantain, morningglory, chicory, eveningprimrose, and purslane. In addition, it delivers the nutrients needed to help recover from damage from the summertime and build strong roots to take on harsh winter conditions. Apply on a calm day when weeds are actively growing and temperatures are consistently between 60 Deg. F and 90 Deg. F. Make sure your grass is moist from dew or sprinkling, as this helps particles adhere to weed leaves to produce the best results. We recommend using a Scotts spreader to apply this product. For Scotts broadcast/rotary spreaders, use a setting of 3 . For Scotts drop spreaders, use a setting of 6. Do not water your lawn for 24 hours after application. This lawn care product is for use on Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass. Do not apply to St. Augustinegrass including Floratam , Dichondra, Lippia, Carpetgrass, or Bentgrass.
$157.99
$126.7520% OFF

Foxfarm Grow Big 1 Qt. 6-4-4 Liquid Plant Food Fgb...

Get your garden going with Grow Big, our liquid concentrate fertilizer that supports lush vegetative growth. Our special brew is designed to enhance plant size and structure, allowing for more abundant fruit, flower and bud development. It is formulated with a low pH to maintain stability in storage and keep micronutrients available. General feeding: 2 to 3 teaspoons 10 to 15 mL per gallon 4 L of water every other watering. Heavy feeding: 4 teaspoons 20 mL per gallon 4 L of water every other watering. Foliar feeding: 1/2 teaspoon 2.5 mL per gallon 4 L . Use a pump sprayer and apply to both sides of leaves. Do not apply while plants are in direct light. Hose end sprayer: Fill sprayer with concentrate, do not dilute. Follow manufacturers instructions for recommended application rates. 6 - 4 - 4.
$40.99
$38.217% OFF

Foxfarm Grow Big 1 Pt. 6-4-4 Liquid Plant Food Fgb...

Get your garden going with Grow Big, our liquid concentrate fertilizer that supports lush vegetative growth. Our special brew is designed to enhance plant size and structure, allowing for more abundant fruit, flower and bud development. It is formulated with a low pH to maintain stability in storage and keep micronutrients available. General feeding: 2 to 3 teaspoons 10 to 15 mL per gallon 4 L of water every other watering. Heavy feeding: 4 teaspoons 20 mL per gallon 4 L of water every other watering. Foliar feeding: 1/2 teaspoon 2.5 mL per gallon 4 L . Use a pump sprayer and apply to both sides of leaves. Do not apply while plants are in direct light. Hose end sprayer: Fill sprayer with concentrate, do not dilute. Follow manufacturers instructions for recommended application rates. 6 - 4 - 4.
$28.99
$27.087% OFF

Drammatic 1 Qt. Organic Concentrate Liquid Plant F...

Liquid fish formula plant food. Produces nutritious fruits, vegetables, and brilliant flowers and foliage. All natural product that is people and pet friendly. Contains natural oils, amino acids, nutrients, and minerals found in fish. Produced from fish scraps that would otherwise go to landfills. OMRI Organic Materials Review Institute listed. Quart concentrate.
$24.99
$23.566% OFF

Foxfarm Happy Frog 4 Lb. Fruit & Flower Fertilizer...

Fertilizer that supports abundant fruiting and flowering. Crafted for organic gardening. Specifically designed to supply phosphorus for fruit and flower development. Also contains nitrogen essential to support growth through the end of the growing season. Mycorrhizal fungi are included to help increase root efficiency, which may enhance nutrient uptake and water absorption. OMRI Listed and Registered CDFA Organic Input Material. 4-9-3.
$27.99
$26.814% OFF

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