my market more cucumbers are growing well in the conservotory lots of tiny ones and flowers with two developing well how do i know when they are big enough to pick to give the others a chance on one plant and three plants also getting big with flowers
Marketmores aren't a small variety, Girlyfox. How big is the fruit now? Colour and feel are the usual cuke tests. They darken in colour as they mature and should feel nice and firm. Best picked earlier than later, though.
15cm long and also lots of smaller ones at the moment
15cm sounds like a reasonable size. If they've turned dark green and are nice and firm, harvest one and try it as a guide. Leave them too long before harvest and the seeds get too big and the cuke is coarse.