This hidden gem in London is inside Richmond Park, Londonās largest royal park, and is free to visit! Isabella Plantation is a secret garden with over 50 species of rhododendrons, as well as bright pink azaleas and camellias ā and the flowers are in full bloom from the end of April to early May. Save this video to plan your trip to this park! To get there enter through the south entrance of Richmond Park and follow the signs to Broomfield Gate. #londonparks #richmondpark #secretlondon #hiddengemlondon