Владимир Соловьёв
— Mikhail Ivanovich Kalinin
Григорий Белов
— Ivan Vladimirovich Michurin
Николай Шамин
— Terentiy
Фёдор Григорьев
— Kartashov
Михаил Жаров
— Khrenov
Константин Нассонов
— father Khristofor
Алексей Жильцов
— Bykov
Иван Назаров
— postman
Виктор Хохряков
— Ryabov
Дмитрий Дубов
— Sinitsyn
Геннадий Печников
— Lesnitskiy
Вячеслав Исаев
— Mayer
Сергей Ценин
— Wallace Beard
Юрий Любимов
— translator
Иван Каширин
— peasant
Sergueï Bondartchouk
— selectionist (uncredited)
Александр Смирнов
— selectionist (uncredited)
Виктор Ключарёв
— professor Kigunov (uncredited)
Павел Гайдебуров
— Pashkevich (uncredited)
Евгения Хованская
— Pashkevch's wife (uncredited)
Alexeï Konsovski
— Pashkevich's guest (uncredited)
Клара Лучко
— Pashkevich's guest (uncredited)
Анатолий Ларионов
— Michurin in his youth (uncredited)
Евгений Гуров
— Bykov's guest (uncredited)
Пётр Савин
— member of the revkom (uncredited)
Николай Хрящиков
— member of the revkom (uncredited)
Анатолий Жуков
— Shurusha (uncredited)
Сергей Антимонов
— official (uncredited)
Михаил Гродский
— professor (uncredited)
Виктор Матисен
— professor (uncredited)