It is a black tulip, but black tulips do not exist. So the black tulips are a deep dark shade of purple, in which stands for Queen of the Night.
tulips (two lips...)
If you mean "Holland tulips", it means tulips from Holland.
There are no specific collective noun for tulips. I have seen suggested, an explosion of tulips and a tiptoe of tulips. However, any noun suitable for the situation can be used, for example, a field of tulips, a bouquet of tulips, a bunch of tulips, etc.
If you are saying that "1 in 4" of the tulips are red, the answer would be 4 of the tulips are red.
No, tulips are multicellular organisms.
Tulips
Tulips are angiosperms.
Tulips are bulbs
Tulips are a spring bulb.
Tulips Tulips
Black tulips can signify many things. But mostly it signifies death, cheating and darkness, but a strange feeling of deluded and subtle passion.