Climate change and population growth are the two most important challengers faced by today. So
that, two field experiments were carried out at the Horticulture Research Farm of El- Baramoon, Dakahlia
Governorate, Egypt, during the two winter seasons of 2017/2018 and 2018/2019 to evaluate the response of
sweet fennel to foliar application with moringa leaf extract, seaweed extract and potassium sulphate levels in
addition to control treatment under two sowing dates, i.e., 15th October and 15th November. The best results
were recorded when sweet fennel seeds were sown on 15th October compared with sowing 15th November in the
both tested seasons. Also, foliar spraying with seaweed, moringa leaf extracts and potassium sulphate improved
vegetative growth, i.e., plant height; number of leaves and branches per plant and fresh and dry weight per plant
as well as yield component, i.e., bulb length; bulb diameter; bulb thickness; seed yield, i.e., number of umbels
per plant, weight of seeds per plant and weight of seeds per feddan and essential oil traits than sprayed with tap
water (control) during the two seasons. The interaction between sowing dates 15th October and spraying with
seaweed extract at 2 g / l resulted in higher values of studied traits in sweet fennel. Thus, we provide the
evidence for sowing sweet fennel on the early date (15th October) then spraying the plants with seaweed extract
at 1 and / or 2 g / l to produce higher vegetative growth, seed yield and essential oil traits in sweet fennel
(Foeniculum vulgare Mill).