Another slug free way of growing slightly more in the poly tunnel….
Make a sloping back wards A framed rack out of wood fit on the proper gutter brackets & four 2 mtr lengths of 4 inch half moon guttering on either side , each a foot higher than the other ( bottom one is also a foot off the floor ). Put a stopped end on each end of the gutters
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Cut some batts of rock mineral wool insulation with a sharp carving knife into four inch width strips so it sits well in the gutters ( angle the cuts to make a sort of chamfer rather than a right angled cut ) . Lay them in the gutters . Fill the gutter with a well diluted tomato feed..... put your plants in .
You can grow all manner of crops this way in or outside the poly tunnel such as radish , celery , cress coriander, parsley, other herbs , cabbages , peas & various flowers .
Because the walls of plants are not vertical but on the slope the plants don't interfere with each other too much . Strawberries are great grown as a wall of them if grown this way
Best of all …. you'll only need to top up the gutters ever other day or so with a new clean mix . Plus you don't get strawberry saw fly attacking the roots like happens when you use a soil based growth medium to grow them in .
Come winter when they stop producing & day light is short slow down with the watering , give them just enough water to keep them alive