To dream of a green poplar denotes fulfilled hopes, if withered it denotes disappointment (Gypsy). It was once held sacred to Hercules. Afterwards it symbolized the Holy Rood of the Christians (Bayley). ... The Fabric of Dream
Vision: Seeing a poplar tree: unlike the palm tree, the poplar promises happiness and a peaceful old age—you are on the right path! Seeing a crooked or stunted poplar tree: let go of deceptive opinions and negative attitudes! Failing to do so means you will always chase after the wrong goals.
Depth Psychology: A straight poplar tree is a good sign and means that you are on the right path.
A crooked poplar tree: you need to make changes!... Dreamers Dictionary
To dream of seeing poplars, is an omen of good, if they are in leaf or bloom.
For a young woman to stand by her lover beneath the blossoms and leaves of a tulip poplar, she will realize her most extravagant hopes. Her lover will be handsome and polished. Wealth and friends will be hers.
If they are leafless and withered, she will meet with disappointments.... Ten Thousand Dream Interpretation