There are, however, also leaf movements in plants without special joints. The movement can be brought about by turgor changes in the cells of the petal.
Some flowers open at certain times of the day.
The process of opening occurs in a few minutes. The first flowers open in the begin of june, the last one in october or even november. The opening of flowers is often connected with fragrance production. One should also test whether perhaps the sensitivity of the human nose and not the fragrance production of the flowers changes rhythmically. For this purpose fragrant substances can be smelled in different concentrations at different times of the day.