I don't have any experience with growing begonias. I ordered from Tulip World and another online tuber vendor. The bulbs from Tulip World are massive... easily double... compared to what I got from the other vendor. In addition to the size, the ones from Tulip World already had significant sprouts. So if you can find what you want here, I think the value is worth it. Shipping to California was quick. I planted each tuber in a 4" pot with a 1:1:1:1 mix of coco coir, pearlite, acidic azalea mix from EB Stone and small orchid bark.