Oh I have whitefly also...think you can dust with derris if you are that way inclined, or spray even. As for where and when, as Wardy says, the little green golf balls appear at the leaf axils, and this year for the first time ever, mine have started within 3 inches of the ground, and they have all be a good size! Now we are half way up and they are monsters! I fear that if you have no sign at all of baby sproutlings yet, you may not get any, however, don't forget you can eat the top of the plant, the leafy green growing point. Apparently, according to mum, that is my nans most fave veg!!