you can make hash from anything just wont get as much and it may be weak but its going to be always stronger than smoking what it was derived from. I always double up if it comes out weak meaning if I am doing iso hash I will use my sweet leaves that have been frozen then use the 90% alcohol to strip the resin clands from plant material, after pourting the mixture into pyrex baking disk to evaporate I will toss in a chunk of hash from last batch just to make it thicker and stronger after adding it to the next batch. I also like to throw in my keif from my stash box which has nice screen to collect keif. You can make the hash stronger by leaving it in the dish and not scrape then do another run and let it evaporate on top of previous batch. comes out thick as shit and stronger than before.