I have green tulips in my garden. I planted tulips of various colours but some have come up green. One would have been a surprise but I now have 14. they have a thicker petal than the other tulips and have a rim of pink at the tip. I have been gardening for over 50 years and never seen anything like them. Are they a proper tulip? One I would have said was a malformation but to have 14 seems a lot considering the rest of the tulips are perfect blooms.