I must admit I didn't think about it again until I read Zanthan Gardens' post on saving bluebonnet seeds. She tells us when we're ready to clear out a patch of spent legumes, do not pull the plants out by the roots; cut them at ground level. This keeps those nodules in the soil where they'll help enrich the soil. Nasturtiums are also legumes - Sure wish I'd read Zanthan Gardens post earlier - this morning I pulled out all the dying and drying nasturtium plants. Live and learn.
Sunday, May 10, 2009
Nitrogen fixing plants
I have always heard the phrase "nitrogen fixing plant" and could tell you that legumes are indeed "nitrogen fixing plants" - but I 've never given a second thought about how a plant actually sets nitrogen. Hubbie is growing soybeans (a legume) this spring and pulled this plant up to check it for nitrogen producing nodules. Check it out, close up - This little guy has three nodules inside the black circle.