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Good Nitrogen Fixing Plants for Citrus, Thats Hardy in Zone 9B

Posts: 2
Location: Phoenix Az, Zone 9B
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New to this forum and permaculture, looking for a zone 9b hardy plant that does a good job at repairing the nitrogen content of the soil for my orange, lemon and pomegranate trees. I ordered some Erythrina herbacea (Coral Bean), I heard through a separate thread that this may be a good one but still unsure. Keep in mind I live where it gets to 120 degrees F.
Mother Tree
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Location: Portugal
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Mimosa and broom are the common ones around here but they might be considered too invasive.

Traditionally, the locals will pee under citrus trees, ensuring each one gets a regular dose.  Your mileage might vary on the suitability of that approach though.
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