There are plenty of good looking tomatoes ripening on the vine in various plots in my community garden. There are also a number of very sad looking tomatoes with yellowing/brown leaves and withering stalks.
Are DC gardeners destined to eventually lose their tomatoes to wilts or blights or other diseases? My answer is no, and here are some tips to help combat tomato collapse:
- Testing your soil. You can improve your chances of growing good crops if your soil has the right balance of nutrients. Right now UDC is offering free testing during July and August. Another option is UMass Amherst’s soil testing lab.
- Watering slowly and deep – slowly so water doesn’t splash onto the leaves, deep so that roots grow down and pick up more nutrients. Best time to water is in the morning
- Cutting off leaves when there is a hint of yellow or brown – or proactively cutting off the bottom sets of leaves to mitigate splashing spores onto the leaves in the first place
- Practicing good sanitation – don’t touch the tomato leaves when they are wet, don’t inadvertently spread disease by touching unaffected plants after you’ve been handling diseased plants
- My alley neighbor, who was a knowledgeable gardener, swore by using a copper spray to combat these diseases. I’ve also read of an effective spray using baking soda or potassium bicarbonate called the Cornell spray. The Internets also shows gardeners using copper wire (inserted into plant stem just above soil line) or making a cut and inserting a copper penny. I think I’ll stick with the methods listed above.
In some cases, the tomatoes aren’t affected (although the plant looks stunted). But if the stalk is withered then the plant should be pulled up and put into your trash (not compost pile). Any tomatoes on the vine should be fine to eat. If they’re green, leave them on your counter top to see if they ripen. Or look up some good green tomato recipes (like this green tomato curry).
What are your tips for growing good tomatoes?