--- title: "Your greens are about to be hollow-cored. Here's how not to lose six weeks of putting to it" url: "https://ifrothgolf.com/read/aeration-season-scoring" type: "explainer" topic: "putters" author: "Ross Hamilton" published: "2026-08-20T18:00" publisher: "ifrothgolf" --- # Your greens are about to be hollow-cored. Here's how not to lose six weeks of putting to it > Late August and September is aeration season across most of the northern hemisphere, and it does something to golfers that nobody warns them about: it quietly teaches you a bad stroke. ## In short - Hollow-coring is essential greenkeeping, but six weeks of slow, bumpy surfaces teaches two bad habits: adding pace by jabbing rather than lengthening the stroke, and rebuilding a stroke around feedback that's actually just surface noise. Move putting practice indoors onto a true surface, lengthen the backswing at the same tempo rather than hitting harder, and judge yourself on start line rather than putts holed. On the course, putt from off the green more, play a touch more break, and attack flags you'd normally avoid — soft aerated greens hold everything. Sometime in the next few weeks, most clubs in the northern hemisphere will hollow-core their greens. Thousands of small plugs pulled out, sand brushed in, and six weeks of putting surfaces that are slow, bumpy and demoralising. Everyone knows to expect it. What almost nobody accounts for is that it doesn't just cost you putts during those six weeks — it can cost you putts afterwards, because of what you unconsciously learn while it's happening. ## Why the greens are like that (and why it's good) Worth understanding, because it stops you resenting it. Hollow-coring removes accumulated thatch and relieves compaction, letting air, water and nutrients reach the root zone. Without it, greens get spongy, hold water, and eventually fail in the way that costs a club a whole season rather than six weeks. Sand topdressing then fills the holes, which is what makes the surface feel gritty and slow. The greens you enjoy in May exist because of what happens in September. Your greenkeeper is not doing this to you. ## The bad habit it teaches Here's the part worth taking seriously. On slow, bumpy greens, putts come up short. So golfers hit them harder. That's correct in the moment and it's the right adjustment. The problem is *how* most golfers generate the extra pace. Rather than making a longer stroke, they make the same length stroke and hit it harder — a shorter, jabbier action with more hand and more acceleration through impact. Six weeks of that is a substantial amount of repetition, and it's a stroke that then doesn't work at all when the greens recover and get quick again. The second habit is subtler: on bumpy surfaces, good putts miss. When the feedback loop between stroke quality and outcome breaks, golfers start experimenting — changing aim, changing grip, chasing a fix for a problem that is entirely the surface. You can arrive in October with a stroke you've rebuilt around noise. ## What to do instead **Move your putting practice indoors for the duration.** This is the single most useful adjustment and it costs nothing but a change of habit. A [putting mat](https://ifrothgolf.com/product/wellputt-3m-putting-mat) gives you a true, consistent surface at exactly the point in the year when the course can't. Practise stroke and start line indoors; use the course for scoring, not for learning. **Lengthen the stroke rather than hitting harder.** If you take one thing from this: on slow greens, make a longer backswing and keep the same tempo. That's how you add pace without teaching yourself to jab. **Judge yourself on start line, not on holed putts.** Whether the ball started where you aimed is entirely within your control. Whether it stayed on line over a sanded surface is not. An [alignment mirror](https://ifrothgolf.com/product/eyeline-putting-alignment-mirror) is genuinely more useful in September than at any other time of year, because it measures the thing the greens have stopped measuring for you. **Accept more three-putts and stop chasing lag pace.** Distance control on freshly cored greens is close to unknowable, and speeds change day to day as the sand settles. Trying to calibrate against a moving target is how you end up distrusting a lag stroke that was fine. ## Scoring adjustments that actually work **Putt from off the green more, not less.** A putter through fringe on slow greens is far more predictable than a chip onto a soft, sandy surface that either checks hard or bounces. **Play more break, not less.** Slower greens take less break in theory, but freshly sanded surfaces are inconsistent enough that a firmer, straighter putt is more likely to be knocked offline. Dying it in on a bit more break gets a kinder result more often. **Expect approach shots to stop dead and plan for it.** Aerated greens are usually soft and hold everything, which is the one gift of the season. Attack flags you'd normally play safely away from — this is the six weeks where a shot at a tucked pin actually stays. **Stop reading putts for as long.** The surface will do what it does. Extra time over the ball on a bumpy green converts nothing and slows everybody down. ## What to do about the practice green One overlooked detail: club practice greens are almost always cored on the same day as the course, which removes the one true surface you had. That matters more than it sounds, because the practice green is where most golfers form their sense of pace before a round. Rolling putts on a freshly sanded practice surface and then walking to a first green that's been recovering for three weeks — or vice versa — is a reliable way to three-putt the opening hole. Two fixes. Ask the greenkeeping team when each was done, since the course and the practice green are often cored days apart. And if the two surfaces are clearly different speeds, skip the practice green entirely and putt indoors before you leave home, because a wrong calibration is worse than no calibration at all. ## The one to remember The greens will be back to normal in six weeks and your stroke should be too. That only happens if you keep the stroke honest somewhere else while the course can't hold it. Practise indoors on something true, lengthen the stroke rather than hitting harder, and judge yourself on start line until the sand settles. Do that and aeration season costs you a handful of putts. Ignore it and it can cost you the autumn — which is, on most courses, the best golf of the year. ## The takeaway Hollow-coring is essential greenkeeping, but six weeks of slow, bumpy surfaces teaches two bad habits: adding pace by jabbing rather than lengthening the stroke, and rebuilding a stroke around feedback that's actually just surface noise. Move putting practice indoors onto a true surface, lengthen the backswing at the same tempo rather than hitting harder, and judge yourself on start line rather than putts holed. On the course, putt from off the green more, play a touch more break, and attack flags you'd normally avoid — soft aerated greens hold everything. ## FAQ ### Why do golf courses hollow-core their greens? To remove accumulated thatch and relieve soil compaction so air, water and nutrients reach the root zone. Sand topdressing then fills the holes. Without it greens become spongy, hold water and eventually fail in ways that cost far more than six weeks of disruption. ### How long do greens take to recover after aeration? Typically around four to six weeks depending on weather, grass type and how aggressive the coring was. Warm, growing conditions speed recovery considerably; a cold snap straight afterwards slows it. ### How should I putt on freshly aerated greens? Add pace by making a longer stroke at the same tempo rather than hitting harder, which is how golfers accidentally groove a jabby action. Play slightly more break, since sanded surfaces knock firm putts offline, and accept that distance control is unreliable until the sand settles. ### Should I still practise putting during aeration season? Yes, but indoors on a true surface. The course can't give you reliable feedback on stroke or pace while the greens are recovering, so use a mat for technique and treat course putting as scoring rather than learning. ## Products mentioned - [WellPutt 3m Putting Mat (10ft First)](https://ifrothgolf.com/product/wellputt-3m-putting-mat) · $110 approx — Where your putting practice should live for the next six weeks **Where to buy:** [Check price at Amazon](https://www.amazon.com/dp/B0789WHQY8?tag=ifrothgolf-20&ascsubtag=md_wellputt-3m-putting-mat) (affiliate link) · also stocked by WellPutt - [PuttOut Premium Pressure Putt Trainer](https://ifrothgolf.com/product/puttout-pressure-putt-trainer) · $40 approx — Keeps the short-putt pressure honest indoors **Where to buy:** [Check price at Amazon](https://www.amazon.com/dp/B09TTL6P2R?tag=ifrothgolf-20&ascsubtag=md_puttout-pressure-putt-trainer) (affiliate link) · also stocked by PuttOUT Golf - [EyeLine Golf Putting Alignment Mirror (Small)](https://ifrothgolf.com/product/eyeline-putting-alignment-mirror) · $50 approx — Fixes the thing hollow-cored greens will hide from you **Where to buy:** [Check price at Amazon](https://www.amazon.com/dp/B0030F4JHM?tag=ifrothgolf-20&ascsubtag=md_eyeline-putting-alignment-mirror) (affiliate link) · also stocked by EyeLine Golf - [Scotty Cameron Phantom 12 Putter](https://ifrothgolf.com/product/scotty-cameron-phantom-12-putter) · $650 approx — Heavier mallets cope better with slow, bumpy surfaces **Where to buy:** [Check price at Golf Discount](https://www.golfdiscount.com/products/titleist-scotty-cameron-phantom-12-putter-2026) --- Source: [ifrothgolf](https://ifrothgolf.com) — independent golf-gear editorial. 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