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20 Extraordinary Plant Trivia Questions and Answers

Reviewed by Stefanie Zaldarriaga, Author·Updated Oct 2025·3 min read

Grow your knowledge with Plant Trivia! From fascinating facts about photosynthesis and famous botanists to the world’s tallest trees and rarest flowers, these questions will test how much you know about the plant kingdom. Perfect for gardeners, nature lovers, or anyone who enjoys learning about the green world around us, this trivia celebrates the beauty and science of plants.

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  1. 1What species produces the world’s largest single flower by diameter?

  2. 2Which plant has the world’s largest unbranched inflorescence?

  3. 3What is the tallest tree species on Earth?

  4. 4What clonal aspen stand is often cited as the heaviest living organism by mass?

  5. 5What is the oldest known non-clonal tree with a verified age?

  6. 6Which plant produces the world’s largest seed?

  7. 7What is the smallest known flowering plant?

  8. 8Which spice is derived from an orchid and typically requires hand pollination outside its native range?

  9. 9Which spice is harvested from the stigmas of Crocus sativus and is famed as the world’s most expensive spice?

  10. 10What common plant compound evolved as a natural insecticide in coffee and tea plants?

  11. 11From which tree is most natural rubber commercially obtained?

  12. 12What type of parasitism is exhibited by mistletoes, which photosynthesize yet tap hosts for water and minerals?

  13. 13Which photosynthetic pathway has evolved independently more than 60 times and boosts efficiency in heat and high light?

  14. 14Which plants open stomata at night and fix CO₂ in acids to conserve water?

  15. 15What ancient seed set the record for oldest to germinate into a living plant?

  16. 16What is the world’s largest tree-borne fruit?

  17. 17Which plants hold the record for fastest growth, up to ~91 cm (35 in) in a day?

  18. 18What notorious “corpse flower” heats its spadix to help broadcast its odor to pollinators?

  19. 19What rainforest figs typically begin life high in other trees and later envelop their hosts with descending roots?

  20. 20Which cereal is the primary staple food for more than half of the world’s population?

Answer Key

  1. 1. Rafflesia arnoldii
  2. 2. Titan arum (Amorphophallus titanum)
  3. 3. Coast redwood (Sequoia sempervirens)
  4. 4. “Pando” (Populus tremuloides) in Utah
  5. 5. “Methuselah” (Pinus longaeva) bristlecone pine
  6. 6. Coco de mer (Lodoicea maldivica)
  7. 7. Wolffia (e.g., Wolffia globosa)
  8. 8. Vanilla (Vanilla planifolia)
  9. 9. Saffron
  10. 10. Caffeine
  11. 11. Hevea brasiliensis (rubber tree)
  12. 12. Hemiparasitism
  13. 13. C4 photosynthesis
  14. 14. CAM plants (e.g., many succulents)
  15. 15. A ~2,000-year-old Judean date palm seed (“Methuselah”)
  16. 16. Jackfruit (Artocarpus heterophyllus)
  17. 17. Certain bamboo species
  18. 18. Titan arum (Amorphophallus titanum)
  19. 19. Strangler figs (Ficus spp.)
  20. 20. Rice (Oryza sativa)

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