Since plants are made of about 98% water, an RH of 55% is like a dry sponge that absorbs as much water from the plant as it can.
(plants; are made; of about 98% water) (an RH of 55%; is; like a dry sponge) (a dry sponge; absorbs; as much water; from the plant)
plants an RH of 55% a dry sponge
are made is absorbs
of about 98% water
like a dry sponge
as much water from the plant