The more you manage for invasive species control the faster the success

Johnson and Handel found through their study of parks in NYC that the level of management intensity is important to overall restoration success. See their study in Urban Forestry and Urban Greening at https://www.sciencedirect.com/science/article/pii/S1618866718306472

Urban Ecological Planning Guide for Santa Clara Valley

Here's a planning guide established for urban biodiversity for Santa Clara Valley, California.
https://www.sfei.org/sites/default/files/biblio_files/UrbanEcologicalPlanningGuide_Final_062019.pdf

Crevice Gardens

“But hang on to your prickly pears. I've discovered there is something even more adventurous than a rock garden, a more extreme version called a crevice garden.”

Read more: http://www.lowellsun.com/lifestyles/ci_32676040/crevice-gardens-urban-models-sustainability#ixzz5qSSZtenB