During the 2018/2019 and 2019/2020 winter seasons, this experiment was conducted under plastic houses conditions in Fayoum Governorate Egypt, to investigate the effects of some stimulants on cucumber growth, yield and fruit quality of cucumber (Cucumis sativus L.) Barracuda F1 hybrid. This experiment included nine treatments as follows: Spraying with tap water (control), sodium selenate (NaSel) at 2,4 and 6mg/l, humic acid (HA) at 1, 2 and 3 g/l, potassium silicate (KSil at 4 and 6 ml/l. These treatments were arranged in a randomized complete block design with three replicates, Spraying cucumber plants with HA at 3 g/l or KSil at 6 ml/l increased dry weight of leaves, branches and shoots/plant, chlorophyll a, b and total ( a+b), number of fruits/plant, average fruit weight, yield/plant and yield /m2 . Foliar spray with KSil at 6 ml /l increased TSS, Vit.C, DM% and K contents in fruits, whereas HA at 2 and 3 g /l or KSil at 4 or at 6 ml /l increased fruit length. It can be concluded that cucumbers are highly responsive to foliar applications of potassium silicate and humic acid, followed by selenium spraying, and the yield can be increased by 58.64 % and 48.79 %, respectively, by spraying with potassium silicate at 6 ml/l and humic acid at 3 g/l (average two seasons)