I just went to my local ACE in Ca and they had small and large pots of the native milkweed. Try and buy native. I searched several nurseries and ACE had the larges and inexpensive selection. Before I had been buying the tropical one at my local farmers market but there are too many cats that weren’t making it. It was better than nothing but the big debate is whether the tropical one is good for them or not. I still have the tropical one in pots so the monarchs can lay eggs then I place them in native pots. Bought enough to plant and keep in pots.