Nitrogen-fixing trees are a fantastic addition to any garden, especially in Southern California (Zone 10), because they improve soil fertility naturally, provide shade, and support biodiversity. Here’s a list of excellent nitrogen-fixing trees that thrive in our warm Mediterranean climate:
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Acacia
Makes a great privacy hedge as well.
Cassia
Desert Ironwood
Ice Cream Bean
I have this one as it is edible and delicious.
Mesquite
Edible & wood can be used to make things like furniture. Also drought tolerant. Commonly used as fodder for animals as well and since most varieties are spiky I suggest for a fencing tree for large properties as well.
Mimosa
In full bloom is very unique with bright pink flowers.
Pacific Wax Myrtle
Palo Verde
Edible and drought tolerant with pretty yellow flowers.
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