I went there and I had a very interesting conversation with her, covers, plant rotation and plant companions, she was so generous in answering all my questions. Thank you! Here is what she wrote on Sunday July 25:
Hi, Coralia,
Thanks so much for your help in the garden yesterday.
I wanted to add to my answers for two of your questions yesterday.1. http://www.botany.com/portulaca.html
The link above should take you to a website that tells of Portulaca, and also lists the more common name for the form apt to show up as a volunteer in the garden: Purslane. Sylvia knows it as Pusley. I wanted to check to see if the commercially available Portulaca was also edible (I've eaten the volunteers in my garden--the plants, that is : ) and it looks like it is as well.
Me: A very helpful information. I am wondering if the weedy wild Purslane who is growing around my tomato plants, are doing its best
2. Companion planting/complimentary planting for legumes (nitrogen fixers) and tomatoes:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEif2vhepEunOqZjiJ739kbgMGx5dbVJ9lsagwlNLKFSRoaWz6tVoA7Rka12fobVQ39MXtEHgYlSBBJumGZH7Rg55tkYWisTP_STuV8m-u9d3yFSM7DvroNe-ktt9PCFA1u7nYDfcFftKdM/s320/101_5842.jpg)
Me: This point sounds to me logical, so if I work with these companions then when the rotation is made, all the 'nitrogen job' is working right there for other plants, who need the N now? Can I think in planting corn there? For me looks like a previous cover plant in the sample of the peas with tomatoes.
3. I can't find anything when I went to search to see if I was remembering correctly about inhibitory effects of tomato plants on nearby plants. I did find that tomato plants can produce some antibiotic compounds and perhaps ones that interfere insects, but not other plants. Sorry to have led you astray on that.
Some perspective on the whole rotation idea, and its possible limitations.
I've been reading a book about plant root systems, which suggests the area covered by vegetable roots is much more extensive than we generally appreciate. This means that what you were suggesting by planting adjacent rows of complimentary plants might work, as their root zones might overlap. The hard part of the strategy you suggested could be then rotating the soil/crop distribution, as it would vary by row, rather than how many people do it by blocks in their garden.
Four groups might be Solanaciae (tomatoes, peppers, potatoes) in one quarter, legumes (peas and beans) in one quarter, brassicas (broccoli, Brussels sprouts, cabbages) in one quarter, cucurbits (cucumbers and squashes and melons) and other crops in the remainder. Planting by block, and then rotating different years, theoretically reduces the chance that pests which specialize in one plant type will be overwintered in an area where they can prey on the same family of plants the next year.
Some people suggest that in usual household gardens, the distances between the blocks is so small relative to how much the pests can move (through the air or through the ground), that the rotation really may not do a whole lot for pest control. It may be more valid for large growers.
Me: That is true, and the monitoring part has an important rol. I have planted tomatoes in one row, and next to them, potatoes. Unfortunately, the potato plants have been infected with colorado potato larvae, tons of those! I was concerned about the tomato of my neighbors, even though I am sure that this colorado potato beetle will never attack tomato plants, but it might attract other pests to the nearby relative. Fortunately, I have detected all these on time, I fixed the problem with some BT - Bacillus thuringiensis, and one of my best pest control: hand picking.
I hope this makes sense. Feel free to send questions if I've been unclear.
Me: Sure! I will.
I don't know if you'll be able to check e-mail from Peru. I'm sure your mother will appreciate your company; I hope she is more comfortable by the time you visit.
A friend of mine, Kathy Personnet, has given me a gift, a wonderful set of her creation, Fraglets (R) Art System, withe them I will play with Mom while in Peru.
Mami Lidia and I - January 2008
Mollendo, Perú