Genus of 50 species of herbaceous plants, annual and perennial, of which some horticultural species and hybrids are cultivated in borders and flower beds, with simple flower heads, similar to those of daisies, or double, similar to carnation flowers.
They are excellent plants for producing cut flowers, which last a long time immersed in water.
THE marigold (also called carnations of India, meaning with India the American continent) are flowers widely used in gardens and pots, thanks above all to their great ease of cultivation. To this they combine the quality of flowering for a long period.
It should be noted that they are very pleasant flowers also for the composition of bouquets to take home or for potpourri. In the first case they have the advantage of lasting a long time, even 15 days. It must be stressed, however, that not everyone likes its scent, which is rather intense and robustly wild.
The marigold it arrived in Europe in the 14th century mainly from Mexico. The genus includes about 30 perennial species in the places of origin, but considered annual by us, since it comes from tropical or subtropical areas.
It has no particular needs regarding the terrain. It is afraid of water stagnation. These herbaceous plants tend to live well in rather light and poor soils. Too rich substrates (especially in nitrogen) stimulate an excessive production of leaves at the expense of flowering. In dwarf varieties the extreme richness of the soil can induce a disproportionate growth and consequently the stems could bend at the first storm.
It is therefore good to choose a soil with a good percentage of sand both in the flower beds and in the containers.
In pots it is always advisable to arrange a good drainage layer on the bottom, composed of gravel, expanded clay or other suitable material.