“I watered those tomatoes every single night. That’s what killed them.” Why so many Australian vegie patches fail every summer — and the hand-blown glass gauge that ends the guesswork
Kerry Pascoe, 69, a former scientific glassblower from Castlemaine, with two of the rain gauges from his last batch.
8-min read by Robyn Kearsley
10 November 2026
Summary: Split tomatoes, yellow leaves, seedlings that keel over in the heat — most summer garden losses are not pests or bad luck. They come from watering that doesn’t match the rain: too much after a storm you underestimated, too little after a shower that sounded bigger than it was. The fix is old-fashioned: measure the rain that actually lands in your own garden. A Castlemaine man who blew laboratory glass for 40 years makes a gauge that does exactly that, calibrated by hand and readable from the path. This is his last batch: 96 gauges.
It’s seven o’clock on a hot November evening. You drag the hose out, give the tomatoes, the zucchini and the new seedlings a good long soak, coil it back up and go inside. At nine the sky opens. By morning the beds are sitting in water.
Two nights later it’s 36 degrees, the storm feels like it never happened, and the lettuce has collapsed by lunchtime. So you water again. And again. Then one morning in January half the tomatoes have split on the vine, the lower leaves have gone yellow, and the zucchini is rotting from the end.
If you have grown vegies through an Australian summer, you have lived some version of this. Most gardeners blame the weather, the seedlings or themselves. Very few realise the real problem is simpler: they never knew how much rain actually fell.
Watered the night before, then a storm on top of it. Split fruit, yellow leaves and soggy soil are the usual result.
Five signs your garden is getting the wrong amount of water
If you recognise two or more of these, the problem is very likely not your soil or your seeds.
The Summer Watering Trap
1. Tomatoes split overnight
A dry spell followed by heavy rain on top of your own watering. The fruit swells faster than the skin can stretch, and it cracks.
2. Lower leaves turn yellow while the soil is still damp
Waterlogged soil pushes out the air the roots need. The plant starts failing from below while the top still looks fine.
3. Plants wilt by midday even though you watered last night
A little water every evening keeps the roots shallow, right where the soil dries out first. A hot afternoon finishes them off.
4. Seedlings rot at the base
Soft, dark stems at soil level are a classic sign of too much water in warm weather. Once it starts, they rarely recover.
5. The water bill climbs, and the garden doesn’t look any better
Under restrictions or not, every evening soak on beds that already had a storm is water and money poured straight through.
The guess that costs you the garden
Ask ten gardeners how much rain fell last night and you will get ten confident answers. Ask them to prove it and almost nobody can. We judge rain by the noise on the roof, by how dark the pavers look in the morning, or by the number on a phone app.
None of those tell you what your soil actually received. A loud summer storm can drop barely 4 mm. A soft, steady shower can deliver 15 mm without anyone noticing. And your plants respond to the millimetres, not to the noise.
Most established beds and vegies are comfortable with roughly 25 mm of water a week, from rain and watering combined, and more in hot, windy weather. Get far below that and shallow roots cook. Go far above it and the roots drown. The space between those two is exactly where guessing goes wrong.
The weather app shows an estimate from radar, spread over a grid that covers many streets at once. Everyone who gardens has watched a storm soak the next street and miss their own.
The glassblower who got tired of guessing
Kerry Pascoe spent forty years blowing scientific glass in a Melbourne workshop: measuring cylinders, burettes, flasks, the kind of glass where a millimetre out means the whole piece goes in the bin. When he retired to Castlemaine, he put in a vegie patch and lost his first summer of tomatoes exactly the way described above.
One measuring tube, still orange on the pipe. Blown glass stays clear for years, where moulded plastic yellows in the sun.
“I bought a plastic gauge from the hardware,” he says. “By February it was yellow, the numbers had faded and I couldn’t read it from the path. So I did what I know. I made one out of proper glass.”
“A garden won’t tell you what it needs. It just quietly gets too much water or too little, and by the time you can see it, you’ve already lost something. All this does is take the guessing out of the morning.”
Why most rain gauges don’t help
“Most of them aren’t built to last a summer,” Kerry says. “They’re built to be cheap.” If you have owned one, you will probably recognise at least one of these:
Four Ways a Rain Gauge Gives Up
1. The plastic yellows and clouds over
Australian sun does to a moulded tube what it does to an old car headlight: yellow, then milky, until you can barely see the water level.
2. The markings wear off
Printed scales fade with sun and rain. Once the numbers go, you are holding a tube that measures nothing.
3. It sits too low or leans
A gauge close to the ground catches splash off the soil, and a leaning one collects more or less than actually fell.
4. It goes brittle, and there is no replacement tube
A season of UV and one knock from the whipper snipper, and it splits. The model is no longer sold, and the frame is just decoration.
What Kerry built instead
Calibrated by hand, like lab glass
Every blown tube is slightly different, so Kerry checks each one against a laboratory measuring cylinder before he marks it. Millimetres down one side, inches down the other.
Blown, then cooled slowly overnight
Slow cooling (annealing) takes the stress out of the glass wall, which makes it far tougher than quickly cooled glass. Clear glass does not yellow in the sun.
The tube lifts out in one motion
The glass sits in an open forged ring. Lift it out, tip it, rinse it, drop it back. No tools, no bracket to unscrew.
Forged iron, not stamped tin
The stake goes in with a push of the heel and stays upright, so the gauge sits at a sensible height away from splash and reads true.
A thermometer out where the plants are
The dial is checked against a reference thermometer before it leaves the bench. Celsius and Fahrenheit on one face, readable from the path, nothing to charge.
A songbird and a dragonfly, coloured in the fire
Worked metal, not stickers. Handmade, so no two are exactly alike.
The most useful thing a rain gauge does is boringly simple: it turns watering from a habit into a decision. Instead of watering because it’s evening, you look at the tube.
Ten seconds with a cuppa: read the tube, empty it, decide whether the garden needs anything today.
After a storm you leave the hose coiled and let the roots breathe. After a hot, windy week you know the beds are behind, even if the sky looked grey. And when water restrictions are on, you stop spending precious water on beds that already had plenty.
💧
You stop guessing whether to water
Around 25 mm a week is a good rule of thumb for most beds and vegies, more in a heatwave, and the millimetre scale runs right up the tube. One glance tells you whether to drag the hose out or leave it.
🍅
You stop drowning the plants you care most about
No more evening soak on top of a storm. Fewer split tomatoes, fewer yellow leaves, fewer seedlings rotting at the base.
🌡️
You see the heat where the plants are
The dial reads the air out in the beds, not on the shaded verandah wall. When it’s already 30 degrees at ten, you know to water deep early tomorrow or get the shade cloth up.
💰
Less water wasted, less hose dragging
You only water when the tube says the garden is short. Fewer pointless evenings with the hose, and less water poured onto beds that were already wet.
In the garden bed by the letterbox, close enough to read on the way past without stopping.
The only rain that matters to your plants is the rain that lands on your soil. A gauge is the simplest way to measure exactly that.
Before and after
Without one
You water every evening and hope it was right
“Big storm last night” — and it was barely 4 mil
Split tomatoes and yellow leaves by January
The app reports rain for half the shire
A faded, yellow plastic tube by February
With one
You water on evidence, only when it’s needed
You know overnight rainfall before your cuppa goes cold
Deeper roots that handle a 38-degree day
You know what fell on your soil
Clear glass and hand-marked scales, year after year
Same backyard, same week: the bed on the left was watered out of habit, the one on the right only when the gauge said so.
I’ve stopped watering the tomatoes every evening out of habit. Some weeks the gauge says they’ve had plenty, and they’ve honestly never looked better. Not one split fruit since. Nothing like the cheap plastic one I had before.
Laurie K., Ballarat VIC
★★★★★
Ordered it half expecting a fight with instructions and a bag of screws. Instead the tube slid straight into the bracket and the stake went in with one push — five minutes, no tools. Two big storms since: no wobble, no fading.
Trevor R., Toowoomba QLD
★★★★★
I hoped the colours would look as good in real life as in the photos — they’re better. You can tell it’s handmade: the glass has weight, the metal feels thick and properly finished. A month out the front and it still makes me smile.
Steve M., Bendigo VIC
Questions people ask before they order
Will the glass handle an Australian summer?
Yes. Annealed glass does not yellow, cloud or go brittle in UV the way plastic does, and the markings are on the glass, not printed on a sticker.
What if the glass breaks anyway?
Glass is glass, so Kerry has set spare tubes aside from this last batch. If yours breaks we send a new tube — free for two years from delivery.
Is it marked in millimetres or inches?
Both. Millimetres down one side of the tube, inches down the other. The dial carries Celsius and Fahrenheit the same way.
Where should I put it?
In the open, away from the house, trees and gutters, so it catches the rain that really falls on your beds. Read it at the same time each morning and tip it out afterwards. In inland areas with hard frosts, lift the tube out over winter; the frame stays in the ground.
The glass travels wrapped in its own sleeve, packed separately from the frame.
At 69, Kerry’s hands are slowly starting to let him down. He gets slower every year, and every tube costs him more effort than the last — one now takes most of a morning. There is nobody lined up to take the bench over, so he has decided these 96 will be his last.
“I waited forty years to make something that was mine. My hands are telling me it’s time to stop, and I’d rather finish properly than let the work get sloppy. I’d sooner they went to people who’ll put them in the ground and use them.”
The facts, at a glance
Made by hand: glass blown and slowly cooled, each tube calibrated against a lab cylinder and marked by hand, frame and stake forged, songbird and dragonfly heat-coloured — by Kerry in Castlemaine, Victoria.
Glass, not plastic: does not yellow, cloud or warp, even in Australian summer sun.
Two readings, both scales: rainfall in millimetres and inches, temperature in Celsius and Fahrenheit — on one stake, out where the plants are. No batteries, no app.
Site it in the open: away from the house, trees and gutters, with the dial in morning sun rather than full afternoon glare — any dial thermometer in direct summer sun reads warm.
The last batch: 96 pieces. When these are gone, there won’t be another.
Update — this week
More than half of Kerry’s last batch has gone since the article went up. Once the rest are sold, he is closing the bench for good.
Gardener’s tip: Read the gauge at the same time every morning, note the number, and tip the tube out. Add up the week on Sunday: if your beds have had around 25 mil, leave the hose alone. If they have had much less, give them one deep soak early in the morning rather than a little every evening — deep watering builds deeper roots that cope with the heat.
