Pumpkin, grass, rose in that order?
Otherwise tennis players are seeded when they play on a COURT
An apricot PIT (or are they pips?) are a kind of seed
Pumpkins, grass, and roses all grow from seeds. Pits are a kind of seed. Yard and Brush are a stretch. I can't imagine going too wrong by guessing PUMPKIN -> GRASS -> ROSE.
PORT and WAVE are my first two choices. The third is less clear.
A ship CROSSes a body of water.
COURT, because "ship" is when fans pair up fictional characters?
Sailing ships have a YARDarm.
Romulan starships carry a CLOAKing device.
Ships can be FIGHTERs, but why not clue Warship?
A ship can be MAMMOTH, but then maybe Titanic is a better clue?