I am fall sowing larkspur, godetia, agrostemma, and sweet peas. I have lots of foxgloves in and aquilegia.

I am wondering if it would be worth ripping a lot of this stuff out next year after the main bloom time (end of June-mid July here for much of the above) to replace with zinnia and aster seedlings and then in the early fall plant out seedlings of the foxglove and aquilegia again.

I envision leaving the best flowers for seed saving.

I have limited space and want to maximise my growing opportunities.

Also, has anyone intercropped flowers for the mid season blooms? I though that might be easier that transplanting them? I am not sure which would work better.

Any suggestions are welcome. I will try both but would love to hear from people with experience.

Interesting foliage - variegation, leaves with a color other than green, varied leaf shapes and height - can do much more in regard to visual interest than focusing on just flowers.

There is an entire forum devoted to companion planting. You may want to check it out if you haven't yet.