Where do you put a photosynthetic Dyson sphere?

One of the answers to What could make a star green? describes a living Dyson sphere made of photosynthetic, plant-like material.

What type of star or star system is ideal for a plant-like Dyson sphere?

Keeping in mind access to nutrients and a healthy dose of radiation...

• Protostars seem like a good choice, as there's lots of material available, but they also seem too chaotic. I don't want my sphere ripped apart. Plus, they go on to form protoplanetary discs, not spheres, making material hard to gather.
• Red dwarfs are cozy radiation-wise but they may not hold much material post-formation
• Brown dwarfs are pretty dim and may not hold much material at a low temperature
• Main sequence stars have usually cleared out all the nearby material
• Blue and white giants have too much deadly, ionizing radiation
• Planetary nebulae sound like a pretty good start, actually
• This is just skimming the surface, and other configurations are bound to exist. You are not limited to this list, these are just my thoughts.

So again, keeping in mind photosynthesis-friendly levels of radiation that won't immediately fry cells - as well as an abundance of material - what is the best system in which to place a photosynthetic Dyson sphere?
_{*Photosynthesis does not necessarily need to use chlorophyll if that matter}

EDIT: If not clear before, I'm looking for a natural system that doesn't have to be edited manually first.

posted about 7 years ago

Zxyrra‭

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