30 Cannon St, City of London 360
We completed the installation of the roof garden on 30 Cannon St in the City of London in July 2016. This historic grade II listed building was designed by Whinney, Son & Austen Hall as an office building for Crédit Lyonnais and built between 1974 and 1977. A comprehensive refurbishment programme has been taking place with the reconstruction of the 5th floor to incorporate additional floor space as well as a new accessible 6th floor roof terrace which we were commissioned to install.
This 7,000sq ft roof garden, with fantastic views of St Pauls’ Cathedral, incorporates a stunning 65 linear metre Cumaru timber feature bench which our in-house carpenter constructed and installed against the bespoke zinc treated and ppc metal planter. Designed by Applied Landscape Design, the original roof garden palette included the installation of 300 shrubs such as Hebe 'Autumn Glory’ and Lavandula angustifolia 'Hidcote Superior' along with over 1,500 perennials which included species such as Erica carnea f. aureifolia 'Foxhollow’, Pennisetum alopecuroides and grasses Sesleria autumnalis, all of which were planted in a blend of lightweight aggregate specially formulated for roof gardens. On the bulb front, over 2,600 were planted which includes the early spring flower Allium ‘Purple Sensation’; Along with Crocus vernus and Galanthus nivalis, the common snowdrop, these bulbs add colour to the garden when little else is awake.
Constructed under cover, our works also included the installation of an automated irrigation system and the laying of pre-cultivated sedum mats; 250m2 of which was laid on the roof edge and top of the air-conditioning housing.
Since the original installation, refinement and additional planting has taken place. We had added nearly 1,500 plants which include Erigeron karvinskianus 'Profusion', Verbena bonariensis 'Lollipop' Kniphofia uvaria.Primulas, Geraniums and Osteospermums. Additionally, three Yucca filamentosa were planted too. The refreshing of the beds is not unusual, as once the client sees the designers planting mature, one can see where improvemnts can be made and our recommendation are put forward.