How to Improve Soil for a Dogwood Tree

Over millions of years, dogwoods evolved to thrive in a specific type of soil. When one is transplanted into a new environment, the soil is rarely ideal — the make-up of urban soil (moisture levels, mineral content, and organic matter) is often entirely different from the soil where flowering dogwoods grow naturally, and it’s frequently compacted and poor. Your job as a homeowner is to make the soil more natural for the tree, and the best way to do that is by adding mycorrhizal fungi.

Why urban soil is hard on dogwoods

A dogwood’s native soil differs from a typical yard in moisture, mineral content, and the composition of its organic matter, and urban soil tends to be compacted and disturbed on top of that. Transplanted into conditions it didn’t evolve for, a dogwood is left to fend for itself — which is why simply improving the soil biology, rather than just adding fertilizer, makes such a difference.

What mycorrhizae are and how they help

Mycorrhizae form when mycorrhizal fungi infect newly forming non-woody roots as shown here.

Mycorrhizae are a symbiotic relationship between beneficial fungi and plants. The fungi live in and around the roots of most plants, and in exchange for sugars and simple carbohydrates from the tree, they absorb and pass back the minerals and moisture the plant needs to grow.

Over tens of millions of years, plants developed this partnership to survive drought, extreme temperatures, and periods of low soil fertility. The fungi colonize the living root system and effectively extend it further into the soil — sometimes by up to 1000% — making them a vital link in the plant’s nutrient cycle. In nature, mycorrhizal fungi are found on about 99% of plant species, but the poor, compacted soils of urban environments often lack this essential fungus.

Help your dogwood thrive and flower

Dogwoods evolved this same relationship with mycorrhizal fungi, but in urban settings the relationship is often broken and the tree struggles in hostile conditions. A common complaint is that a dogwood won’t produce flowers — and because flowering takes a great deal of energy, a dogwood under stress will often forgo it. The single best contribution you can make to your tree’s health, and its flowering, is to reduce that stress by adding beneficial mycorrhizal fungi to the soil.

Which product to use

Use a mycorrhizal product matched to dogwoods — the fungi that benefit one tree species aren’t always the right ones for another. TreeHelp Mycorrhizal Treatment for Dogwood supplies the right fungi for a dogwood’s root system. For a complete approach that also feeds the tree, the TreeHelp Annual Care Kit for Dogwood pairs mycorrhizae with a dogwood fertilizer and a biostimulant.

Frequently Asked Questions

What’s the best way to improve soil for a dogwood?

Add mycorrhizal fungi. Urban and transplant soil rarely matches what dogwoods evolved for, and mycorrhizae rebuild the root-fungi partnership that lets the tree pull in water and nutrients.

How do mycorrhizae help a transplanted dogwood?

The fungi colonize the roots and extend their reach into the soil — by up to 1000% — trading minerals and moisture for the tree’s sugars, which eases transplant stress and improves drought and heat tolerance.

Why won’t my dogwood flower?

Flowering takes a lot of energy, so a stressed dogwood often skips it. Reducing stress — starting with mycorrhizal fungi in the soil — is the best way to help it bloom again.