if you're going to sell them it's commen decency to grow them atleast a foot tall, or until they start getting nice a leafy and becoming beautiful little babies. as for growing them in secret unless you got a really big yard or a damn good hiding place i wouldn't suggest it, although i could never give up my babies if i had some. it would quite literally be like selling my child. the cops came once and had to trash our whole planter full of pot plants growing. it was such a sacraligous act