About Exhibition Blenheim Palace Flower Show 2026 will be held from 19th - 21st June 2026 at Blenheim Palace in Oxford, England, United Kingdom. This is a popular trade show and exhibition on beautiful plants, shrubs, trees, indoor and outdoor plants. All the visitors can enjoy Garden Talks with experts and enthusiasts, fabulous food and drink as well as more than 300 exhibitors, an outdoor Plant Village and live entertainment throughout the weekend.