If you want to stay with the plant themes stick with the Warden Sylvari weapons. You could also try the Nightmare weapons that are closer in color. There is also this special named Sylvari weapons that might work.
Simple and elegant, just got to love Sylvari and their armor. Some more variation would be nice to see, as despite the armor just being solid, it's a bit bland nowadays.
With some extra coloring (I know Ocean and Cyanide work quite well for this), I think the Dreamthistle Weapons could work. https://wiki.guildwars2.com/wiki/Dreamthistle_weapon_skins
They're quite pricey though, but their elements can be woven excellently into Sylvari-themed builds.