If organizing is an issue, then grow stuff that isn't permanent? Can try potted pansies to start since they are low care, or tomato plants, as tomato are very hardy & grow just fine with forgetfulness or inattentive care & don't require much space at all. Snapdragons are also low care like pansies & fill out fast. I highly recommend those two in small potted planters if you want flowers & worry about organization. They replant well & could be moved easy, just don't try to keep them indoors. I also like daffodils as they are hardy & will regrow every year from bulbs, & you can dig them up & move them easily if needed if you mark areas.
If you want something more permanent & with no organization, you can look into wildflower mixes & just do above-ground planting & just see what grows for fun! My grandma was a heavy gardener but these were all her favorite easy plants to keep flowers in her garden for a long time. Plus side to terracotta planter pots is that you can also decorate them with stickers under a gloss coat or paint them! I liked putting dinosaur toys into mine also, ahaha.