According to the folk calendar - Fyodor Zhitnik

Fyodor Zhitnik is celebrated on May 29 (May 16, old style) according to the folk calendar. The day is named in honor of St. Theodore the Sanctified, the Egyptian abbot, whose memory Christians honor on this date. Theodore was born in Egypt in the 4th century into a family of wealthy Christians. From his youth he was drawn to the Lord, so at the age of 14 the young man went to live in a monastery, where Pachomius the Great was the abbot. For his selfless fulfillment of monastic rules, Theodore was appointed Pachomius' deputy. After the death of his mentor, Theodore took over his post. Years later, for his wisdom and skillful leadership abilities, he was appointed abbot of all the monasteries of Thebaid. The abbot ended his life at a respectable age. The people called Theodore Feodor Zhitnik. His nickname came from the word "zhito", which meant grain used for baking bread. Also, zhito was consonant with the word life, and bread has always been considered the source of life. This day was the last day when peasants sowed fields with grain crops: barley, rye, wheat, oats. Before work, the peasants prayed to Saint Theodore for the well-being of the business. On Fyodor Zhitnik there was a tradition of preparing dishes from grains. By evening, housewives prepared porridge from rye, barley, oatmeal or wheat, baked pies and bread. Barley beer was also served on the table. The peasants believed that by eating food made from cereals, the harvest in the fields would be excellent. Usually on Fedorov's day the rowan blossomed inflorescences. With its flowering, summer weather arrived, colds and frosts subsided. Peasants valued rowan; they planted it in every yard because they believed that it helped against the evil eye and damage. Rowan berries were used to strengthen the immune system, to raise stomach acidity, and the leaves were used to stop bleeding and protect against infections. On this day, healers collected its inflorescences and prepared medicinal potions. If the rowan tree on Fyodor Zhitnik had not yet blossomed, then a protracted autumn was foreshadowed. The abundance of formed rowan berries promised a harsh winter season. Lush inflorescences on rowan trees were observed to lead to rich yields of flax and oats. If you heard a frog croaking in the rain, you were preparing for fine days. The flowering of the water lily meant that the cold would not return.