Polypodium to the Rescue

This spring I’m hoping that some Polypodiums will help me in some hard to plant up areas! In our rock banking there are numerous crevices between the stones that needed to be cemented to keep back the ever persisting erosion caused by sudden flooding as well  as a intense  water table causing some stones to slip. It works well to keep the erosion at bay but then these areas become barren with out much life. I don’t doubt that over time with some organic material that  would gather up some nice specimens may emerge, but I wanted to quicken this process, and a fern experiment is fun.

We have several old clumps of Polypodiums at Harlow Carr and one was infested with some persistent Symphytum which dominated its fronds. This gave me an opportunity to break it apart and divide out its rhizomes and showcase it another way. I just needed to be super careful to avoid planting back any Symphytum roots as they are so similar.

In the cemented crevice I actually first put a small layer of our grey clay here so the compost has something to attach onto. and gave the mix some weight.  I also used the clay here because I’m so close to the waters edge, during a storm the water levels rise and the flow can be intense , easily washing away anything not well rooted. The lack of drainage is a concern but over time its my hope that the Polypodiums will mature and catch more organic matter and crawl over the stones.  I could also make a bowl shape with the clay as well to hold the compost in a vertical crack.

It’s my hope these crevices ‘green up’ with ferns , especially some  lovely creeping and crawling Polypodiums!

https://www.rhs.org.uk/gardens/harlow-carr

Polypodium overtaken by Symphytum
Polypodium rhizome
Polypodium planting in cemented crevice
Planting with clay in cemented crevice
Compost ready crevice
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