Lettuce (Lactuca sativa L.)is a nnual plant from the Asteraceae family. It is grown as a leafy vegetable almost all over the world for the heads, which are mostly used in the fresh state. The most commonly grown varieties in our area are butterhead and crisphead. The lettuce can be grown in sheltered areas where it is provided with all the necessary conditions for cultivation throughout the year , or outdoors during the spring and autumn. When the lettuce is grown outdoors it is advisable to use mulch to preserve soil moisture, soil temperature and reduce weeds, which ultimately results in better development of the heads, which is the main objective of cultivation. This paper describes the cultivation of lettuce (butterhead and crisphead) without mulch, with mulch of hay and mowed grass whereby the influence of mulch on the development of the aboveground part was monitored.. Cultivation of mulch lettuce resulted in higher values of height, width and mass of Butterhead lettuce heads compared to cultivation without cover, and a higher mass of crisphead lettuce heads when grown with mulch was also found. The butterhead lettuce with mowed grass had a greater height, width and weight of heads compared to the lettuce grown under the hay mulch, while the crisphead lettuce found a greater head mass when grown with hay as a mulch.