deffinetly wait bro, i have some @ 25 days and there is no way i want to sample yet and i have major crystalization. if you have grown before you will find that it is never worth taking a sample unless you know a branch off by accident. if you cant help yourself then you need to wait until at least the 6th or 7th week. i know it is tempting but the budz look nothing like what they will look like in a month. late