Firmiana simplex - 4m is unavailable at this time.
Please try searching as it may be available at a different size/price.
Originating from Vietnam to Japan
Grow in moist but well-drained soil in sun. Books will tell you that it is only half-hardy but it grows outside at the nursery. What's more, Firmiana simplex is used as a street tree in Beijing where the climate is far harsher than the UK.
Eventual mature plant size :