Grevillea plants should be placed in very bright places, but protected from direct exposure to sunlight that could ruin them, especially during the hottest hours of the summer days. It is a plant that prefers warm climates and does not tolerate cold temperatures, so it should be grown at home at a fairly constant temperature. If it is placed outdoors, it must be carefully repaired because it would not survive the rigours of winter.
The best temperature for Grevillea specimens is about 22 degrees in summer, while in winter it can vary from 7 to 13 degrees.
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For a good growth of these plants, the soil must be moist and must be left to dry between one watering and the other because the plant of grevillea does not stand waterlogging. When it is very hot, water is sprayed on the canopy with constant nebulisations that allow the plants to have an ideal habitat. Watering must be abundant from April to September. In autumn and winter it is watered every two weeks, without exceeding.
During the growing season, a few drops of liquid fertilizer are added to the water of the watering every three to four weeks.
For the planting of these plants is recommended to choose a soil that presents an excellent drainage, so it is good to prepare a compound of peat and sand of neutral or acid reaction, free of limestone. Grevillea plants do not tolerate excess humidity and it is important to check that the soil chosen is the one indicated for their cultivation.
It can be sown in March April in pots filled with a mixture of peat, non calcareous garden soil and sand in equal parts at a temperature of 13 – 16 degrees. When the plants are large enough to be handled, they are planted in individual pots. In April – May, cuttings five to seven centimetres long are taken from the side shoots with a portion of the woody branch. The cuttings are planted in a non calcareous compound.
The pots are covered with transparent plastic bags and kept at 21 degrees Celsius. The rooted cuttings are repotted and kept sheltered until spring; they are planted in May.
In April, uneven, cold-damaged branches can be cut off.
Grevillea: Pests and diseases
Plants of this type are rather resistant to the attack of parasites and diseases, however, it can happen that the Scudetto ladybirds attack the leaves, which yellow and fall. It is good to check if you notice signs of this type of problem, to intervene quickly, or eliminating pests with a cotton ball or, if the attack is quite massive, through the use of systemic products that ensure the elimination of the problem. Excess moisture can lead to dangerous rottenness.
The Grevillea rosmarinifolia is an evergreen shrub native to Australia; to the genus grevillea belong about d
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