My room mate has grown some plants - they are about 4' tall - they are a very green type of weed - they now have little berry like pods all over - it kinda looks like a Xmas tree - I assume these are flower buds - a few are starting to open -are these the buds? - should he pull the plants? or let them open?.... the buds are yellow - and white - but - mostly green...a little brown and red at the top....they have been in for about 18 weeks total