The National Botanical Research Institute is a plant research centre set in historic Lucknow garden grounds. For visitors, the interest is less the laboratories than the green space, plant collections, and the reminder that Lucknow's old estates and scientific institutions are part of the city too.
Access and visitor arrangements can vary, so check current public entry before going. If open, it makes a quiet botanical counterpoint to the imambaras, markets, and memorial parks that dominate most Lucknow itineraries.