How to water
Santolina is a plant that has a very low need for water. Usually, during the coldest periods, it is even satisfied with only rainwater. It is good, however, to water it once every two weeks or so when the climate becomes drier and more arid. It is advisable to avoid proceeding with further wetting than those indicated. In fact, exceeding in supplying water to the santolina, one risks only to cause the asphyxia of the roots and the consequent root rot, one of the principal causes of death of the plant. Before proceeding with a wetting, carefully check that the soil is dry. Therefore, as a general rule, the plant should be irrigated only in summer. Furthermore, santolina does not have any particular needs as regards the water to be used for irrigation.
How to take care of it
As for the exposure of santolina, it is good to place the plant in sunny areas. There should be no negative consequences if you choose a semi-shaded area, but in any case the santolina seems to be more healthy when it enjoys sunlight for several hours a day. Although it tolerates the cold winter temperatures quite well, during this season it is good to shelter the plant which could be ruined by strong seasonal winds. The multiplication of the plant can take place by seed, by cutting or by dividing the heads. If you choose to proceed by seed, it is possible to start sowing in late winter in protected places or in spring if this process is carried out directly in the open air. In the case in which the multiplication by cuttings is chosen, the cuttings are placed in a sand and peat soil until the rooting is done. Once the sprouts have appeared, the plant can be planted.
How to fertilize
To correctly fertilize santolina it is possible to proceed in two different ways. You can choose to fertilize the plant using a specific liquid fertilizer for flowering plants that will be diluted with irrigation water to be applied about every 20 days, or apply a slow-release granular fertilizer to the bush once every 3-4 about days. It is essential that these fertilizers contain the three basic chemical substances (nitrogen, phosphorus and potassium) in equal parts. As for the soil, the santolina is not a plant with any particular needs. However, the best choice seems to be a substrate that is loose, well-drained, sandy and calcareous. The soil to be supplied to the plant will be the same even during the repotting process.
Among the parasites that can attack the santolina stand out the aphids, or plant lice. In case you notice the presence of these parasites, it is good to proceed with appropriate pesticides. As for other insects, the santolina appears to be resistant to possible attacks and infestations. If the environment in which the plant is grown is too moist, the santolina can be attacked by mushrooms of various kinds. If their presence is found, it is good to proceed quickly with appropriate fungicides. The santolina could suffer in the presence of too rigid climates. In this case, it is recommended in winter to protect the soil with a mulch made from straw and dry leaves. Finally, it is good to carefully check the soil before irrigating to avoid causing root rot.