Why Autumn Is the Green's Most Important Season

After a summer of league matches, friendlies, county fixtures and roll-ups, your green has given everything it has. By late September you can usually see the evidence: worn ends, thin patches around the rinks, a spongy feel underfoot and a thatch layer that has quietly thickened since spring. Autumn is the greenkeeper's chance to give something back.

There is a practical reason to act now rather than in November. Soil temperatures are still in double figures through much of September and October, which means grass roots are actively growing and will respond quickly to scarifying, aeration and feeding. Wait until the ground turns cold and wet and you will spend the winter looking at a tired surface that cannot repair itself.

The aim over the next six to eight weeks is simple: relieve compaction, remove thatch, restore levels and get the grass strong enough to survive frost, snow and long spells of wear and tear.

Scarifying: Clearing the Thatch Before Winter

Thatch is the layer of dead stems, roots and organic matter sitting between the grass and the soil. A little is useful; too much and it holds moisture, harbours fusarium and moss, and makes the surface springy and slow. Autumn is an ideal time to thin it because the grass has time to recover before growth stops.

Work in two directions, usually at right angles, rather than trying to remove everything in one brutal pass. A powered scarifier with a fine-tined reel is ideal for a bowling green, set to just touch the soil surface on the first run and slightly deeper on the second. On smaller clubs, a spring-tine rake or a drag mat pulled behind a mower will do a useful job, though it will take longer.

• Scarify when the surface is dry — damp thatch tears rather than lifts.
• Collect the debris as you go; leaving it on the green only feeds the problem.
• Avoid scalping. If you can see bare soil in stripes, you have gone too deep.
• Follow with a light roll only if the surface needs it — never on wet ground.

Aeration: Letting the Roots Breathe

Compaction is the quiet enemy of a bowling green. Every mower, every roller and every pair of bowls shoes presses the soil particles together, squeezing out the air that roots need. The result is shallow rooting, poor drainage and a surface that puddles after a heavy shower.

Hollow tining is the standard autumn treatment on most UK greens. Using tines of around 12 to 16mm diameter, punch holes to a depth of 75 to 100mm, spacing them roughly 100mm apart, then collect the cores and work the holes in with top dressing. For lighter soils or where hollow coring is too disruptive, solid tining or slit tining with a pedestrian aerator will still open up the profile nicely.

Timing matters. Aerate when the soil is moist but not waterlogged, and avoid working the same lines repeatedly — vary the direction so you do not create a pan just below the surface. If your green has a serious drainage problem, autumn is the moment to talk about it, before another wet winter makes the decision for you.

Top Dressing: Restoring Levels and Smoothness

Top dressing does two jobs at once: it fills the aeration holes and helps break down the thatch, and it restores the levels that a season of play has gradually worn away. Use a dressing that matches your existing soil — a sandy loam for most greens, or a sand-based mix if that is what the profile is built on. Mismatched material can create a sealed layer that causes more trouble than it solves.

Apply in thin layers rather than one heavy coat. Around 1 to 2kg per square metre per application is a sensible starting point, brushed or luted into the surface so the grass is not smothered. Two or three light dressings through September and October are far better than a single thick one.

• Water the dressing in lightly if rain is not forecast.
• Pay extra attention to the ends and the worn rink lines.
• Check levels with a straight edge across the green as you work.

Feeding, Overseeding and Mowing Into Autumn

Autumn nutrition should encourage root growth, not lush top growth that will only sit there and rot. Switch to a feed that is low in nitrogen and higher in phosphate and potassium, and stop applying nitrogen well before the first frosts. If you overseed — and it is worth doing on thin ends and worn patches — use a suitable ryegrass or bent and fescue mix and keep the seed moist for the first fortnight.

Mowing should continue while the grass is growing, but raise the height gradually from around 5mm in summer to 6 or 7mm by late autumn. Keep the blades sharp, remove the dew before mowing, and never mow through frost. Brushing the green on dewy mornings does more for disease control than most sprays.

Getting the Green Ready for Winter

Once the work is done, the priority is protection. Keep players off the green during frost and snow, put out boards and signs, and clear fallen leaves regularly so the grass is not smothered. Check gutters and drainage outlets before the heavy rain arrives, and make sure the surrounds and ditches are clear.

A well-maintained autumn green will come through winter with its roots intact and its surface true. Come April, when the first bowls of the season roll smoothly down the rink, all those hours in the drizzle will feel like time well spent.