These plants have a first phase of growth in which you spend most of the energies to the strengthening of roots and foliage; subsequently the energies move on the production of seeds which is essential to guarantee the survival of the species. The period that elapses between the germination and the final drying stage of the plant is called vegetative season (from here the name “seasonal”). Another type of plants are those perennial in their country of origin but are treated by annual because they are not able to withstand along to our cold temperatures of the winter season. These rooms offer a beautiful flowering in the hot season, then close the life cycle in the autumn. There is also the possibility to maintain these plants in greenhouses during the winter season, even if generally prefer to repurchase them from year to year.