I like the articleGeneralities Petunia
This plant in the spring, summer, autumn, winter assumes a purple colouring; it is medium in size and can reach 30 cm high. It doesn't keep its leaves in the winter. The development is erect, they tend to grow both in height and in width, giving origin to a rounded shrub. These plants have a one or two year development. Fertilization Petunia
Before placing the annuals, letís enrich the soil with a small dose of organic fertilizer or slow release granular chemical fertilizer; during the spring we should use a specific fertilizer for flowering plants to be mixed with the irrigating water, to be used every 20-30 days. Exposure Petunia
These plants can be brought outside only if there isn't any more danger of freezings. Usually they are moved to the garden, or terrace, during the months of April-May. Plant which need at least a few hours a day of solar light.These plants shouldn't be grown in the garden during the cold period; in autumn the plants usually perish, and should be eradicated from the ground. Watering Petunia
Letís avoid watering the the Petunia excessively, always leaving the soil dry for a few days between one watering and the other, therefore letís irrigate the substratum deeply every 1-2 weeks with 2-3 glasses of water . As the cold weather arrives, in autumn, we can interrupt watering, and let the plants perish. Treatments Petunia
As the day-time temperatures rise at the beginning of the spring, it is agreeable to practice a preventive treatment, with a wide-range insecticide, which should be applied when there arenít flowerings in the garden. Before the buds become too large, it is advisable to also treat them with a wide-range fungicide, to prevent the development of fungal diseases which spread easily when there is an elevated environmental moisture. Soil Petunia
They prefer dissolved soils, with an optimal drainage.
If desired, we can grow the the Petunia in a container. The indications given in this article are related to a medium size plant.