Of unknown antecedents, Gardener was residing in Winchester by the early years of Henry V’s reign.
Before his only known election to Parliament Gardener had undertaken various responsible tasks for some of his fellow citizens. As an executor of the will of Agnes (d.1416), the widow of John Steor†, he helped finalize the sale of her property in Wongar Street, and in 1423, as the only surviving executor, he completed transactions regarding her holdings in Colebrook Street.
Meanwhile, along with Robert Colpays*, the Winchester lawyer, in 1444 Gardener had been made a feoffee of annual rents of £4 from property situated outside the city, in Otterbourne, by grant of the former mayor John Wryther* and his wife,
