In terms of weight and the amount of cannabis a patient can actually possess, there is no defined legal possession limit as of yet. There are some restrictions with regards to products that can be bought. Those who qualify for medical marijuana in Texas can only purchase cannabis products that are no more than 0.5% THC (tetrahydrocannabinol) and no less than 10% CBD (cannabidiol) from a licensed dispensary. Cannabis flower and marijuana-infused edibles are not available to legally purchase in Texas.
Texas still has some harsh penalties for possession of cannabis without any form of prescription or certification.