It's a seder - you don't bring a thing, including flowers. The tables already are too full (wine, seder plate, salt water and parsley for dipping, charoset, hagaddahs, etc.), and trust me, your host has enough going on, they do not want to deal with flowers upon your arrival.

If you must, write a thank you note after, but truly, this is NOT a hostess gift event.

Anonymous wrote:Are you allowed to open wine?

Yep, opening wine on Shabbat is fine.

Anonymous wrote:

Anonymous wrote:Do not do flowers unless you arrive plenty of time before sunset. If they’re orthodox, then they are not allowed to arrange flowers in water after candle lighting, which is before sundown. Kosher wine is a much better option IMO

At Seder or just on Shabbat?

Both