The ridged Rootrainers cells direct the plants' roots to grow vertically towards the drainage hole. Rootrainers are easy to assemble, they open out like a book, allowing you to monitor how your plants' roots are developing whenever it's convenient. I grew all of the Sweet Pea plants for my 2016 Sweet Pea Trial in Deep Rootrainers.
I used Dalefoot Composts' peat free compost when I potted up this Sarcococca confusa, a highly-scented, winter flowering evergreen shrub. This shrub will be planted out in the spring, as soon as a space becomes available. The pot in this photograph is narrower at its opening than in the middle, with pots such as these, care is required to pot on your plant before it needs repotting so as to avoid damaging the plant's roots as you remove it from the pot.
Simon Bland from Dalefoot Composts is a fantastic ambassador for peat free compost, when he's not working to produce peat-free compost, Simon works to restore peat bogs. I've been trialling Dalefoot Composts in my own trials with great results.
Sweet Pea seedlings sown on 26th October 2014, pictured on 16th November 2014. I sowed all of my Sweet Peas for this trial in Rootrainers, using New Horizon Organic and Peat Free Multi Purpose Compost.