It is fine to place a few spent flowers on the ground nearby if you are just passing through and find a few blossoms that need deadheading. If you have a lot of deadheading to do, however, one consideration is that in certain cases, the plant debris may harbor insects/diseases, or encourage them, so it might be best to dispose of the spent flowers elsewhere, such as in the compost pile (unless the flowers are obviously diseased), or, if you have access to a wilder area such as a woods or meadow, you can place the spent flowers there for wildlife to enjoy. Also, if you place on the ground cut flowers that have already formed seeds, you may find volunteer seedlings popping up the next growing season (although newer varieties may have sterile seeds). Hope this helps!
It is fine to place a few spent flowers on the ground nearby if you are just passing through and find a few blossoms that need deadheading. If you have a lot of deadheading to do, however, one consideration is that in certain cases, the plant debris may harbor insects/diseases, or encourage them, so it might be best to dispose of the spent flowers elsewhere, such as in the compost pile (unless the flowers are obviously diseased), or, if you have access to a wilder area such as a woods or meadow, you can place the spent flowers there for wildlife to enjoy. Also, if you place on the ground cut flowers that have already formed seeds, you may find volunteer seedlings popping up the next growing season (although newer varieties may have sterile seeds). Hope this helps!