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Clover and vetch would add some nitrogen to the soil.
Ok, I see what you are thinking. In my case, I use nitrogen rich chicken run compost to top off the raised bed. So, I do not think I'm lacking nitrogen. But I get your point now. Thanks.
I have a pack or two of radish seeds that I have not used. So, I was thinking about tossing them in the new bed. Also, I still have a pack of 100 onion bulbs that I think would have more than enough time to grow as green onions. I also have lots of extra bean seeds saved from last year. I planted my beans about a month ago, and they are doing fine, but I suppose they would make a good cover crop in the sense that they put nitrogen back into the soil instead of drawing it out.But veggies would be good too. I just didn't know if you were wanting more veggies this year or just wanted to plant something in it.
Thanks for the response which got me into thinking about options I still have available to me. Here is a little something I learned from Copilot when I posed the bean question to it...
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You're in Zone 3B, which means your growing season is short and your first frost typically hits around **mid-September**. That makes it too late to expect a full **bean harvest**, especially since most bush beans need **60–70 frost-free days** to mature. But your idea to use the extra seeds as a **cover crop** is spot-on—and quite resourceful.
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Even if you don’t get beans to eat, the plants can still benefit your soil:
- **Nitrogen Fixation**: Beans are legumes, so they’ll enrich the soil by fixing nitrogen—especially if you inoculate the seeds before planting.
- **Biomass for Composting**: The foliage adds organic matter when chopped and dropped in fall.
- **Weed Suppression**: Dense bean growth shades out weeds and protects soil from erosion.
- **Soil Structure**: Roots help loosen compacted soil and improve drainage.
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- **Plant ASAP**: Get those seeds in the ground now to maximize root and foliage growth before frost.
- **Use HT pallet wood beds**: Since you’re already building hügelkultur beds, beans will thrive in that loose, nutrient-rich environment.
- **Inoculate if possible**: A rhizobia inoculant will boost nitrogen-fixing performance.
- **Chop and Drop**: Before frost hits, cut the plants at soil level and let them decompose in place or till them in.
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If you ever want to try a **cold-hardy legume** for future cover cropping, **fava beans** are a great option—they germinate in soil as cold as 35°F and fix loads of nitrogen. You could sow them in **late summer or early fall** and let them overwinter, then chop and drop in spring.
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I think I'll go with the radish and onions option this year for the new raised bed. But all that info on beans as a cover crop was interesting.