Two weeks of nothing new setting, despite flowers still opening, is the single most reliable sign a summer crop is finished. Not one slow week. Not a few yellow leaves. Two straight weeks of no new fruit forming is my line in the sand, and I use it on tomatoes, zucchini, beans, the lot. Here’s how I tell a spent plant from one that’s just having a rough patch, and what I’d do about it this week.
The 30 second check
I walk the bed and ask four questions. If I answer yes to two or more, I pull it that day.
- Has more than half the canopy gone yellow or brown, starting from the bottom?
- Has there been no new leader growth or flower bud in the last 7 to 10 days?
- Has fruit set stalled completely for two weeks, even though the plant is still flowering?
- Is the base of the stem going woody and hollow instead of green and bendy?
I don’t rely on how the plant “looks” from a distance. Those four checks take less time than making a cuppa and they stop me guessing.
Five reasons I hang on too long
I’ve made every one of these mistakes myself, so I rank them by how often I actually catch myself doing it.
- Sunk cost. I spent effort growing it, so I keep watering it. My fix: I ask whether I’d sow this exact plant from seed today. If the answer’s no, it’s done.
- Waiting for one last flush. A plant already in decline rarely produces a flush worth more than what a fresh planting would give in that same square of bed over the next six weeks.
- Temperature confusion. A plant sulking through a cold snap or a heatwave looks exactly like a spent plant for about a week. I give it seven full days of decent weather before I make the call, not one bad morning.
- Disease dressed up as tiredness. Powdery mildew and blight both cause leaf drop that reads as natural aging. I check for actual lesions or powder on the leaf surface before I write it off as “just old”.
- Fear of bare soil. I used to leave a dying plant in place because an empty bed felt worse. It isn’t. A struggling plant feeding nothing back into the soil does less for me than compost plus a quick cover crop.
When to pull, by zone
In my own subtropical patch around Dayboro, 48 hours of humidity above 85 percent on a spent summer crop is a mildew risk I don’t wait out. It comes out that day.
In warm temperate zones like Sydney or Adelaide, a tomato holding on into the shoulder season is fine to leave another fortnight if night temperatures stay above 12°C, but I still run the two week fruit set check before I decide.
In cool temperate zones, from Melbourne down to the tablelands, first frost is the hard deadline no matter what the plant is doing. Frost damaged tissue is an open door for disease, so I pull within 48 hours of the first frost even if the plant’s still setting.
I write the sowing date on a stake when I plant, so I’m not guessing later how long something’s actually been in the ground. The only hard part is remembering not to keep the dead ones company for old times’ sake.
