My understanding is pretty much what you said—when the going is good, then go asexual (e.g. strawberry runners, grasses or Asian knotweed), but also try for seeds, There are a couple of species of plants that have lost the ability for sexual reproduction, but I can’t recall them right now. That being said, various plants used by humans can be pretty much exclusively reproduced asexually and so have lost the ability for sexual reproduction, specifically because they have very stable environments. The obvious examples are seedless fruits (bananas, grapes), but ginger and garlic are interesting plants that have been propagated from cuttings or bulbs for thousands of years and so lost the ability to produce seeds (with the normal caveats).
Aphids are also an interesting example, where the previous year’s eggs hatch in the spring as females, which then clone themselves as fast as possible—when there’s too many of them they will create clones with wings, and when autumn comes around, they will create male clones to then go through the normal sexual reproductive route. Which is also an example of the stable/unstable environment issues you mentioned.
My understanding is pretty much what you said—when the going is good, then go asexual (e.g. strawberry runners, grasses or Asian knotweed), but also try for seeds, There are a couple of species of plants that have lost the ability for sexual reproduction, but I can’t recall them right now. That being said, various plants used by humans can be pretty much exclusively reproduced asexually and so have lost the ability for sexual reproduction, specifically because they have very stable environments. The obvious examples are seedless fruits (bananas, grapes), but ginger and garlic are interesting plants that have been propagated from cuttings or bulbs for thousands of years and so lost the ability to produce seeds (with the normal caveats).
Aphids are also an interesting example, where the previous year’s eggs hatch in the spring as females, which then clone themselves as fast as possible—when there’s too many of them they will create clones with wings, and when autumn comes around, they will create male clones to then go through the normal sexual reproductive route. Which is also an example of the stable/unstable environment issues you mentioned.