Ipomoea batatas

photo credit: Forest and Kim Starr

Best practices for survivability and field observations

Many respondents report it as a successful long-living, ground cover species, and that it has the potential to prevent other weeds from invading the area. Several respondents noted that they use it as a seasonal cover (a six month crop), with one noting the importance of planting in the wet season. Cultural uses include its importance as food, dyes, medicine, as a kinolau, and for use in ceremonies.

Stressors and pests

Noted pests include stem borers that kill top growth and sweet potato bugs. Several noted that pigs (and likely deer and goats) love the species and one noted that it isn’t tolerant to trampling. The herbaceous “top growth” part is long lived in the best conditions, noting that tubers (potatoes) if left too long in ground will rot. Another suggested contacting Kahanu Garden, Maui Nui Botanical Gardens for ‘Uala Working Group contacts who have done recent research into ‘uala. A possible best practice was to perhaps clear tubers seasonally so that the site does not become habitat for pests.

Availability and propagation

Several noted it is readily available and that some varieties do produce seeds (Hawaiian heirloom varieties may be tricky since they may not produce tubers). Many said common varieties can easily be propagated from cuttings if planted for food (tubers are generally harvested every 6 months or so and replanted from cuttings). Another mentioned that drought tolerant varieties are available.

Survey Results

For information about the survey, refer to our article: on Coastal Plants for Creating Green Breaks