Rosa rugosa f. alboplena

Rosa rugosa f. alboplena 'Alba' has small, white flowers that are not overly showy. However, its fragrance is one of the strongest of the roses in our collection. Similar to what we have experienced with other rugosa roses, it is not uncommon for it send up suckers, or stems, a few feet away from the main plant. This is easily remedied by using a shovel to sever it and remove it. 

At Brookgreen Gardens, we have been continually impressed by how Rosa rugosa f. alboplena 'Alba' has performed. We have found this rose to show very little signs or problems with black spot (Diplocarpon rosae) or other fungal problems. The shrub is generally full with leaves and is overall a strong performer and great addition to the landscape.

Black spot can cause leaves to develop black spots with blurred edges, yellowing leaves, and eventually partial or entire defoliation. While black spot is rarely fatal, it can weaken the rose by reducing its leaves and therefore its ability to photosynthesize. Although similar in appearance to cercospora leaf spot, black spot can be distinguished by the less defined and more feathered edges of the spots. As with many fungal problems, issues are generally worse in areas with high humidity. Black spot can be treated chemically. 

At Brookgreen Gardens, roses are rarely sprayed for fungal, insect, or other environmental pressures or problems. The Poetry Garden at Brookgreen Gardens is maintained as a completely spray-free rose garden, favoring the use of disease resistant roses and proper cultural practices.