1. Dedicating a bench at the Royal Botanic Gardens usually costs between $12,000 and $19,500 for ten years, depending on the location. This typically includes a plaque and helps maintain the gardens. Prices can vary for gardens in different regions. 2. If you become a member of the Royal Botanic Gardens, you'll get the Gardens Magazine four times a year, which is once every season 3.One of the most interesting plants at the Royal Botanic Garden Sydney is the corpse flower ( Amorphophallus titanum ). It is special because when it blooms, it smells really bad. This smell helps attract flies and beetles, which help the flower grow. The corpse flower is very rare and only blooms once every 7 to 10 years . It comes from Indonesia , and there are not many left in the wild. I chose this plant because it is big, strange, and amazing . It smells bad, but people still love to see it because it is so rare and special.