Comment “Flock” for a link to my blog post and video with all my tips and tricks about flocking your own tree including what to use and how to do it indoors. Is it easy to flock a ten foot Christmas tree? Well, it’s not that hard really. Spray, flock, spray. Can you really flock indoors? Yes! Just skip the sifter and protect your floors and you should be good. How much flock do I need? It depends on how big your tree is and how much flock you use. I probably used 5 pounds in this tree this year.