Respondents: 48 (This poll is closed)
[name_f]Marigold[/name_f] is one of my favourite names, and has similar length to [name_f]Primrose[/name_f] and isn’t too similar, so she’d be my first choice. I also like [name_f]Lilac[/name_f], [name_f]Azalea[/name_f], and [name_f]Tansy[/name_f]. I’m not sure if I’d actually use two flower names for twins irl, but [name_f]Marigold[/name_f] and [name_f]Lavender[/name_f] are two of my favourite names and I’d be very tempted to use them together. I’d maybe do it if there were other kids in the sibset to balance it out.
I like [name_f]Aster[/name_f], [name_f]Lilac[/name_f] and [name_f]Marigold[/name_f]. [name_f]Do[/name_f] you like [name_f]Lavender[/name_f]?
[name_f]Primrose[/name_f] and [name_f]Marigold[/name_f] 
I would name twin girls as flowers, but maybe use other kinds of names for siblings.
[name_f]Primrose[/name_f] and [name_f]Lilac[/name_f]. I love both names and they sound good together. My second choice would be [name_f]Azalea[/name_f]. I also like Zinnea.
[name_f]Primrose[/name_f] and [name_f]Aster[/name_f].
[name_f]Aster[/name_f] is gorgeous and makes [name_f]Primrose[/name_f] feel quirky/offbeat, rather than frilly.
I was going to vote Primrose & Marigold as on paper they’re perfect together, however, actually imagining them on two little girls, especially twins, they feel too much for me, too sweet, too flowery, too matching.
For that reason I prefer some of the less “sweet” flower names, personally I voted for Azalea but I like Camellia as well!
The ones I’d drop would be Aster (I don’t like -as- at the beginning of any name, it doesn’t feel very kind to me) and Tansy (but that’s just because I personally think it sounds very whiny).