Update on the Alfred Caldwell Lily Pool Restoration

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While the Lily Pool has remained closed during the restoration of Caldwell’s historic pavilions, our stewardship staff have made the Pool’s gardens their focus, accomplishing extensive work throughout the space. Work to restore Caldwell’s gardens to his original vision has been ongoing since Spring of 2022, but has been accelerated by our crew’s ability to work unencumbered this season. 

Lily Pool erosion - Update Blog

A primary goal of our horticulturists is to restore the soil’s health, particularly in areas that have suffered compaction and erosion from off-path travel by visitors over the years. Many visitors don’t realize stepping through the garden beds not only tramples fragile plants, but also causes lasting harm to the soil, leaving it barren and inhospitable. It only takes a few treads to press out the oxygen roots need to survive and grow, especially in a dense clay soil like that of the Lily Pool. Without roots to hold the soil, it’s briskly carried away by wind and rain. Some of this eroded sediment also washes into the pool, degrading its quality. 

Lily Pool Soil Health
At some time prior to 2022, in reaction to this erosion, plastic netting and aggressive grass seed was applied to hold the slopes’ soil in place. A quick, inexpensive fix was necessary to halt the rapid deterioration and prevent more soil loss and runoff into the pool. Over time, however, the quick fix had deleterious effects of its own— the netting stymied the growth of desired roots and groundcovers while the grasses spread and smothered more delicate plants.
 
Lily Pool Groundcover

Currently, aggressive grasses are being methodically weeded and plastic netting painstakingly removed to allow the carpets of violets and bursts of ferns envisioned in the Lily Pool’s original design to thrive in their place. 

Lily Pool Violets

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