All superglues set/cure when exposed to moisture*.
I'd take the wood out of the water, put a big blob of the gel onto it and then squish on the plant. It should set fairly quickly.
You can then continue attaching other plants, but try not to let them all dry out. A plant sprayer can be used to keep them moist.
*Did you know that the first superglue was developed as a wound-closure agent, for combat situations? This is why superglues are so adept at sticking to your fingers and why I always have an unopened tube of the gel in my First Aid boxes.