Green Roof Experiential Learning Blog 1

My name is Chenni Zhu, a third-year MLA student. On the first day we went up to the roof garden, what we were required to do is to remove invasive weeds and pick up mature fruits of some crops such as tomatoes, shallots in the nine modules on the ground. Then we need to weigh the fruits from crops and record the numbers. And I feel what a pity that most of crops grown on the roof in summer are dead for these one or two months. It may be due to the harsh weather which is too hot and dry without frequent precipitation in Texas.

So on the first day, we almost removed all of the weeds in the nine modules. However, what we saw in the next week surprised us that many weeds had grown up again in the modules due to a rain in that week. Thus, we had to weed them again to ensure there is no chance that these weeds would come up again. I have to say that the invasive weeds are really strong and capable of establishing themselves in prevailing conditions without manual intervention, while we should take more care to crops.

After weeding, we were required to discuss what kinds of crops are capable of living on the roof top and surviving well. A study about “Assessing Crop Viability for Agricultural Production on Extensive Green Roofs” provided us with some statistics about which crops are suitable for growing on the roof in Texas. The evidences showed that the strong survivors (80 %+) include Chives, Cilantro, Parsley, Thyme and Mint among transplants. Moreover, among direct seeded crops, strong survivors include Arugula, Garlic, Kale, and Shallots. On the other hand, every team member was required to provide a list of suitable crops for growing on roof. So based on the study and the information I collected, I think the Arugula, Chives, Cilantro, Mint, Shallots and Thyme are ideal crops surviving on the roof. After that, we discussed the final crop species and basic layout of them according to the visual effect of combination of crops, the different demands on water amount of different crops, and numbers of crops.

Below shows the later situation of some crops we grew on the roof. Most of them are in a good condition.

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