I have dug several large clumps of Daffodils, all different varieties from my neighbors yard that is being cleaned out to return to, horrors, just lawn

I dug them up while they were blooming. Some clumps had tons of blooms, some had only one or two. I cleared off all the soil, and other junk I did not want. I cut off the blooms. I left the foliage. I potted them up giving them each more room.

My plan is to plant them out in the fall and just store them outside in the pots over the summer. What can I do for them to keep them healthy? Fertilize now? If so, with what.

When I plant them in the fall fertilize then? Use bonemeal? And how do I use it. I read somewhere NOT to put it in the hole because it will harm/burn the bulb.

Thanks for any help!

Are you unable to put them back in the ground now?

I put the ones without foliage in the ground. The rest have to wait

Kudos to your level of patience! Tending extra pots all summer isn't for me. (So have no idea how to tend potted Daffs, but hopefully someone who does will pop by!) Good luck!

I'd probably wait till fall to fertilize. Those in pots will just need water till foliage turns yellow which will happen rather rapidly I'd imagine. At that point they can be de-potted and hung up in netted bags till fall (or left in pots). Bonemeal is considered a good fertilizer for bulbs, I usually just mix it into the soil where bulbs are planted.

I'll probably just leave them in the pots. No tending to them, other than keeping an eye out they don't get too wet I guess

Daffs aren't as prone to rot as other bulbs, but keeping the pots as dry as possible during the summer is a good idea. They are likely to sulk for a year, but be patient, they will look great for many years thereafter.