They need better agronomic care and more attention than normal gardens as usually plants are forced to live in little deep substratum and with poor recycling of mineral salts which means that they are subject to drying up and to the nutritive elements exhaustion. This is the reason why they have to be more watered during the period of greatest water imbalance, to be more weeded to ventilate the soil, to receive more manure. During the weed time (autumn/winter) it is suitable to give the ground organic nourishment (soil, peat, green compost) to enrich the substratum and to increase its fertility.