Tagasaste (Cytisus proliferus) is an incredibly useful plant.
It’s called ‘Tree Lucerne’ because it is beloved by livestock and just as nutritious for them. The super abundant flowers are a favourite of bees, I’ve never been near one in flower without needing to be cautious.
Tagasaste is a legume, so shares that group’s association with bacteria that fix nitrogen in the soil (could you call this a ‘fixation with nitrogen?). It has two different types of roots that perform two different functions which both support plants that grow near to it.
Tagasaste has roots that go deep into the soil and subsoil, bringing up moisture and nutrients. Then there are the shallow, surface roots responsible for absorbing nutrients.
Now, here’s the interesting part, Tagasaste actually waters the surface soil around it with water pumped up by the deep roots. This means that the surface roots and mycelia can continue to break down and absorb soil nutrients even in the driest weather. Other plants nearby can benefit from this too in difficult conditions.
I only found out about this recently and plan to integrate a couple more of them into the garden before Summer hits.
Tagasate is used around the world as a windbreak and fodder crop. It grows back well with more nutritious leaves after being cut or pruned.
Locally, its a weed. That’s great news too because it shows that it is hardy and well adapted to our local climate.
What more could you ask from a plant?