That is an interesting thougt... I was teached the needle is actually a leaf rolled up... this way they loose less water... I only have one in my garden. A christmas tree one dat. It just grew a bit bigger. Nice to see. Trees and plants do have a lot of water inside. Once I had to cut down a large tree. The tree expert told me at the moment it was done over 800 m3 of water was coming out of that tree into the air. Can you imagine that amount. A tree is also absorbing a lot of poison etc. If it dies it sets it free as well.