How does your garden grow. (Names of flowers)

[tonandsix]

1. Around a shellfish.
2. The well ordered universe.
3. A non-moving buzzer?.

(Number of letters in answers not given.).

[valerieb1254]

3) Astilbe ( a still bee )

[valerieb1254]

2) Cosmos.

[tonandsix]

My thanks to you and you've enabled me to stop my head swimming. I can now think of other things. Regards.

[ivaclue]

could 1. be periwinkle

[tonandsix]

More thanks are due and it makes me realize that there are some very clever people out there.
That's a good thing as otherwise the dumb ones (I'm one example) would be stuck for answers.
Cheers.