Show #128 - Soil Science, Coir vs Peat & Lawn Health

You Don’t Grow Vegetables — You Grow Soil

There’s a simple truth in gardening:

You do not grow vegetables.
You grow soil — and soil grows vegetables.

Annuals, perennials, groundcovers, vegetables, and lawns all require excellent soil. The smaller and newer the plant, the more critical soil quality becomes.

Modern Soils Have Changed Everything

Today’s soils are far superior to what gardeners had decades ago.

Top choices include:

Fox Farms Happy Frog Soil Conditioner
Salamander Soil

Both contain:

Mycorrhizae
Humates
Coir-based structure (not peat moss)

Why Peat Moss Is Out

Peat moss has major limitations:

One-year shelf life
Loses porosity (like a stale potato chip)
Poor water regulation
Anti-hydrophobic — stays wet or stays dry

Peat was designed for greenhouse use where plants are transplanted within 6 months — not long-term garden use.

Europe over-harvested peat bogs and destroyed them. The sustainable replacement is coir, made from coconut husks.

Why Coir Is In

Coir advantages:

5+ year shelf life
Regulates water efficiently
Lasts five times longer than peat

Available options:

Cultivation Nation
Coco Loco (70–80% coir with perlite)
Coast of Maine Castine Mix (with mycorrhizae and humates)

The Most Popular Soil Amendment: Composted Bark

Extra-fine composted bark (like Betty’s Clay Cutter) has been used since the 1960s for:

Azaleas
Fruit trees
Roses
Most woody plants

Benefits include:

Increased air content
Organic matter
Winter root insulation
Improved water management in clay soils

Soil Air Content Matters

Clay soil: 3% air
Healthy soil: 20% air

Air is the bloodstream of soil — nutrients and water move through those air spaces.

Large shade trees need some clay to anchor against wind, but:

Understory trees (dogwoods, redbuds) need better soil
Smaller and newer plants need the best soil preparation

Understand Soil Nutrition

Soil is like a refrigerator:

It stores food and water
You must put nutrients into it

Even premium soils like McGill’s Soil Builder (nitrogen = 2) are nutritionally considered zero without fertilizer.

All soil requires fertilizer to become enriched soil.

Vegetables Need Lime — Especially Hydrated Lime

Soft tissue plants (especially vegetables) require lime to make nutrients available.

Hydrated lime:

Available day one
Applied directly in planting holes
Essential for tomatoes, peppers, and vegetables

Other limes are too slow:

Pulverized: 1 year
Granular: 6 months
Pelleted: 3–4 months

Those are for lawns — not vegetables.

If you haven’t limed in two years, 71% of your fertilizer is wasted.

Great Lawns Are Built from the Soil Up

80% of lawn chemistry exists in the top 1” of soil.

Modern lawn care requires:

Core aeration (not dethatching)
Top dressing with quality soil
Yearly liming
Long-term fertilizer like Turf Trust

Without top dressing, aeration holes refill with bad soil — wasting the process.

Shade Changes Everything

Sun creates microbial activity (soil actually grows)
Heavy shade reduces microbes
More shade = more soil rebuilding needed

Shady lawns require extra soil and seed work to succeed.

Choosing the Right Soil for the Job

Coir-based soils → general planting & houseplants
Bark-based soils → woody trees and shrubs
Difficult plants (Rhododendron, Daphne, Lavender) → use both

Every houseplant in America suffers from tired peat-based soil. Refreshing the top 2” with coir-based soil and switching to granular fertilizers dramatically improves performance.

Early Spring Weed Prevention

As snow melts, watch for:

Small, light green broadleaf weeds

Gallery prevents them:

Apply early spring if missed in fall
Works preventatively — does not kill

Remember:

80% of weeds are in mulch beds and edges
Fertilize and mulch first
Apply Gallery over dry foliage

Kill small weeds early to avoid big holes later.

Post-Emergent Weed Control

For existing broadleaf weeds:

Mix 1.5 oz Fertilome Weed Free Zone
With 1 oz Wilt-Pruf
In 1 gallon of water

Kills broadleaf weeds without harming grass. Always eliminate weeds before they go to seed.