Green Roof Experiential Learning Blog 2

And we also added new nine modules for growing proposed crops. In making the substrate and filling soils in the module, firstly we put a layer of substrate to fill the holes in the modules, and a square blanket was used to cover each modules on the top of substrates. And soils for growing vegetation are put on the top of blankets. The texture of substrate soils is coarse which can contribute to positive drainage within the modules and the texture of topsoil is finer than substrate soil and it is opulent with organic matter and water content.

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Then the most interesting part came! The transplanted and seed crops arrived, which included Arugula, Chives, Cilantro, Mint, Shallots and so on. Prof. Merrill helped us arrange the layout of different crop species and we took off the outside plastic packings of transplanted crops, burying the roots under the topsoil. Talking about the most difficult part, I think it is to install the irrigation system. I didn’t participate in that part, but I saw my teammates tried to connect the pipe with water source, cut the pipe according to the dimensions of modules, used nodes to connect pipes with chemical glues. Finally, four irrigation nozzles were set up around the crop modules. The nozzle radius is suitable for the site, but one full-nozzle should be replaced with half-nozzle.

Another type of plants we want to grow is succulent plant. So we also had a discussion about the appropriate species for roof planting and before that we each people had a suggestion list. I proposed 6 succulent plants, and I feel so honored that 4 of them had been chosen for growing on the roof, which include Sedum palmeri, Graptopetalum paraguayense, Opuntia cacanapa ‘Ellisiana’, and Euphorbia resinifera. Many other succulent plants are also proposed, such as Nolina macrocarpa, Hesperaloe parviflora, Sempervivum ‘Carmen’, and Agave colorata x parryi and so on. We spent much time on arranging and distributing them in a well-organized and good visual-effect way. We made the short plants as ground cover distributed around the tall plant in the center. The same species are arranged together forming a group.

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