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DIEHARD™ Injectable

DIEHARD Injectable is an injectable mycorrhizal inoculant designed for root injection and soil drench applications. It contains Endo and Ectomycorrhizae, biostimulants, beneficial bacteria, humic acids, sea kelp, and yucca extracts. This blend supports quick root colonization and promotes water absorption, nutrient uptake, flowering, and growth. It reduces the need for fertilizer, pesticides, and irrigation, while boosting plant survival and soil health. Compatible with most trees and plants, it’s a powerful biological tool for professionals.

Grow trees with confidence using Horticultural Alliance products
Trees
Grow evergreen trees with confidence using Horticultural Alliance products
Evergreen Trees
Grow shrubs with confidence using Horticultural Alliance products
Shrubs
Grow evergreen shrubs with confidence using Horticultural Alliance products
Evergreen Shrubs

Price range: $61.69 through $1,965.00

DIEHARD Injectable is a powerful injectable mycorrhizal inoculant used in root injection and soil drench applications to boost plant performance and reduce stress. It contains a balanced blend of Endo and Ectomycorrhizal fungi, chosen for their ability to rapidly colonize plant roots across a wide range of species.

This product improves root development, water absorption, and nutrient availability by enhancing the symbiotic relationship between roots and soil fungi. With deeper, more efficient root systems, plants experience better survival, quicker growth, and increased flowering and yields.

The formulation includes humic acids, soluble sea kelp, yucca plant extracts, and a robust mix of beneficial bacteria. These components stimulate soil health and microbial activity, while also supporting cell division and overall plant vigor.

DIEHARD Injectable reduces plant losses, the need for chemical fertilizers, pesticide use, and irrigation frequency. It also helps protect plants from heat stress and drought conditions, making it ideal for use in challenging environments or on stressed vegetation.

This injectable mycorrhizal inoculant is compatible with all plants that associate with ecto and endomycorrhizae, including trees, ornamentals, and shrubs. It’s a versatile solution for arborists, landscapers, and plant health professionals seeking a natural, science-backed approach to root zone management and long-term plant vitality.

HOW IS IT USED?

Established Trees:

Root Injection: Inject in a 2.5 in to 3 foot grid pattern from the trunk out to the drip line and beyond. Apply 1-2 quarts of solution per injection site. Use up solution by the end of the day.

Drip Tape and Microjet: Decant product before adding to mix tank. Apply at the rate of one pound per acre every six months. Supplement each 3 months with BioRush®at two pounds per acre.

Irrigate after application.

New Tree Planting:

Mix with water and use as a mud-in drench when planting new trees. 1 lb. treats 175 one-year trees.

Small and newly planted trees and shrubs. Inject along the original root ball in 2-3 places using minimum ½ gallon.

The information provided in our informational documents is for general guidance only and is subject to change without notice. While we strive to ensure accuracy and relevance, updates or modifications may occur over time. 

Your order will typically ship within 3-5 business days. Please note that weather conditions and carrier delays may occasionally affect shipping times. If your item arrives damaged, please refer to our return policy for assistance

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