The poplar is a problematic, short lived species. I suggest you remove yours now and replace with a better species.
If a pine tree is pruned back farther than where there are living needles on a branch that branch will not regrow. Therefore if you have a branch that is too long you need to cut it back to the trunk or where it joins another branch. There is therefore not a good way to keep a pine more compact due to the fact that they won't regrow from a more severe pruning like most other tree species will. If you want a pine tree to not be so large your best bet is to plant a more dwarf species such as Japanese Black pine.
Paperwhites do well in an area with most day sun or even in the shade of a deciduous tree where they foliage can receive sun during the critical late winter to spring period when the bulb's energies are replenished.
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