Fall is definitely in the air, and it’s mid-September already. I finally decided to prune the indeterminate tomatoes that are still doing well, even though the predictions are that we won’t get a frost until the end of October. Our “normal” first frost is around Oct. 5, but what is “normal” anymore? Regardless, it’s time to encourage those indeterminate tomatoes to quit growing taller, and enlarge and ripen the fruit they’ve already set. I do this in three steps. “Normally” I time Step 1 to occur about 6 weeks before our first expected frost, so I’m a bit late, if the predictions are wrong and frost comes in early October instead, but I think it will work out fine.
Looking at the photo above, you can see that the tomato plant has reached the very top of the trellis. It’s still producing abundant new tip growth and new flowers. It’s time for that to stop, so I cut each and every branch back to just above any walnut-sized fruit. That eliminates all that top growth and dozens and dozens of flowers. “Walnut-sized” is for a full-size, slicing or beefsteak tomato. And that’s it for Step 1. Sounds easy, and it is, but it takes longer than one might expect and produced a large pile of trimmings. Here’s a plant after pruning, with all those new-growth ends removed.
You can see the tomatoes more easily. Since the days are shorter, and the sun is getting a bit “weaker” I don’t worry about sun-scald at this stage. And, I still continue to fertilize weekly, because there’s a LOT of tomatoes on there that I want to harvest. I’ll wait another week before doing the same Step 1 on cherry and grape indeterminate tomatoes, because their fruit matures and ripens more quickly. Check back next week for Step 2.