flower in pot

Impossible.

C'est très difficile.

That is a LOT of guess work after the pot and stem.

A lot of guessing, but you can get it logical (with only two solutions):
r1:c1-c5,c11-c15
r2:c1,c6,c10,c15
r3:c1,c3,c7,c9,c11-c12,c15

r6:c2,c7-c9,c13
r7:c3-c12
r8:c3,c7-9,c17-20
r9:c2,c8-10,c16,c20

r13:c1,c5-6,c9-13.

Pretty, though!

Thank you for the clues!

Pretty, but I wouldn't want to try this without the hints.