Mushroom treatment

I've tried to grow mushrooms from packet several times but with no success. Can't work out what went wrong. Picked up a packet for 50p from Poundstretcher a few weeks ago and decided to try again.

Mixed the spores in well wrotted compost and left in a tray in a bag for 2 weeks on a shelf in the shed.

Spores had begun to spread into the compost. Time to get a move on...

B&Q are doing 70 litre bags of peat-free compost for £3.00! Bargain. So, covered the tray with a layer of the good stuff - faint whiff of horse poo? - watered, then back into the shed. Should have some mushrooms in a couple of weeks. Watch this space!