Apple is the most widespread fruit species, grown mainly in the continental part of Croatia. The most important agro-ecological conditions for growing apples are climate, soil and location. Apples are suitable for a temperate continental climate with an average annual temperature of 8 to 12 degrees Celsius. The development of the red colour of the skin of apples is related to the light, temperature and nutrient conditions in the tree. Spring frosts damage the blossoms, and high temperatures cause burns on the fruit. Loamy, sandy soils are best for growing apples. Apples are best suited to southern locations in areas with higher rainfall and higher altitude. The slope of the land of about 4 % allows easy drainage of surface water and excess soil water and good exposure of the tree crowns. Foliar fertilisation has a significant influence on the quality of the apple fruit. Summer pruning and reflective film improve fruit quality of overlong, spindly apple trees. Mechanical thinning has a greater influence on the quality and stability of nature than chemical thinning. Water dosage is very important when irrigating orchards. The most favourable water temperature for irrigation is 25°C, and the difference between the water temperature and the temperature of the fruit tree must not exceed 10°C. The 'Drip-to-Drip" system has proven to be the most suitable for irrigation. Fruit grown under nets is of lower quality, has less carbohydrates and tastes worse. White and coloured nets let light through better than black nets. Apples under white and yellow nets are better coloured than apples under black and red nets, and the process of photosynthesis is also stronger under yellow and white nets.