If you are looking for flowers then you're answer is the Titan Arum which blooms every 4 years if you want to see it go to Kew London. Tallest Plant= California Redwood. Also in Kew. But the largest is actually the Aspen (I know its dumb is it not) You can find them practically anywhere in Europe & US/Canada.
Giant Kelp
Jupiter is the largest plant
allium
The largest unicellular plant is Caulerpa taxifolia, also known as "Killer Algae." It is a type of green seaweed that can grow up to 3 feet long.
the kelp is the largest plant in the ocean
Bamboo is the well known name for the largest variety of grass, known for its tall and sturdy stems that can reach significant heights. It is a versatile plant used for various purposes such as construction, furniture, and food.
Sequoia sempervirens
Pumpkin plant
The largest plant on earth by volume is probably the giant sequoia tree.
The families Nepenthaceae and Sarraceniaceae are the best-known and largest groups of pitcher plants.
iT is the emar
Enron is largest gas power plant in world.