Ash Firewood: Why It Earned Its Reputation, and the Catch

Ash deserves its reputation, and the famous rhyme about burning it green overstates a real advantage rather than inventing one.

Why it burns well

Four properties, and ash has all of them at once, which is rarer than it sounds:

Density without excess. Ash sits in the upper band of common firewoods for heat per volume, close to oak and beech. Dense enough to hold a fire, not so dense that it is reluctant to catch.

Straight, even grain. It splits cleanly, often in a single stroke, where elm tears and sycamore binds. Anyone who has processed a cord by hand will rate this far higher than the specification tables suggest.

Low moisture when green. The distinguishing feature, covered below.

Clean burning. Little smoke, few sparks, modest residue, no resin. It is well behaved in an open fire as well as a stove, which not every good firewood is.

The rhyme, and what it actually means

The traditional verse puts ash alone among woods that will “burn when it is green”. It is not folklore inventing an advantage — it is folklore noticing one.

Freshly felled ash often carries a green moisture content in the thirties, where oak and beech arrive in the fifties, sixties or higher. That difference is large enough to change behaviour: fresh ash will catch and burn where fresh oak hisses, steams and goes out.

What the rhyme does not say is what that costs you:

• Wasted energy, spent evaporating water rather than heating the room
• A cooler flue, which is how creosote forms and accumulates
• More smoke, which matters increasingly where air quality is regulated
• Blackened stove glass within minutes

Seasoning it

The same rules as any firewood, with a shorter clock:

1. Split it. Round logs dry through the ends only
2. Off the ground — pallets, rails, anything with air underneath
3. Covered on top, open at the sides. A tarp down the sides traps moisture and grows mould
4. Wind matters more than sun. An open breezy spot beats a sheltered sunny one
5. Nine to twelve months for split and well-stacked ash
6. Check it on a fresh split face, not the outside — see the moisture chart

Standing dead ash, which there is a great deal of in affected regions, is often already part seasoned and can be ready considerably sooner.

The thing that matters more than any of this

Burning locally-sourced dead ash is good practice — it uses wood that would otherwise rot and it takes affected material out of the landscape. Driving it somewhere is how the problem spreads.

Buying it

Ash often commands a premium where firewood is sold by species, and that premium is largely justified by how quickly it is ready to burn.

Questions to ask, in order:

• Is it seasoned, and to what? Ask for a moisture figure, not a season
• When was it cut? Twelve months split and stacked is the realistic minimum
• What length is it cut to? This determines how much wood a “rick” actually is — see rick of wood dimensions
• Where is it from? Relevant for quarantine areas

A seller who can answer the first two precisely is usually worth buying from. One who says “it’s been down a while” is selling you water.