The Great Gardening Challenge Main cast, played by Carol Klein Episode 1x01: Episode 1 (Jul 2, 2019) Episode 1x02: Episode 2 (Jul 9, 2019) Episode 1x03: Episode 3 (Jul 16, 2019) Episode 1x04: Episode 4 (Jul 23, 2019) Episode 1x05: Episode 5 (Jul 30, 2019) Episode 1x06: The Final (Aug 6, 2019)