I am sure they are challenging but the real challenge is the Black velvet alocasia (regulina). I have ordered all but Crystallinum from Glasshouse Works about 5 weeks ago and have not received them yet. This is even after talking with the owner and being assured that they would ship that week and then again next week and then who knows? Hard to recommend this retailer. Getting frustrating. I paid with Paypal and almost ready to file a complaint.