This species has declined across wide areas of its former range, mostly due to expanding urban settlements and collecting. Subpopulations near Port Elizabeth and between PE and Uitenhage no longer exist. Although extent of occurrence and area of occupancy are smaller than required for an Endangered listing status, the species is known from more than five locations. The listing of Endangered is based on population declines of more than 50% over the last three generations (600 years) and that this is likely to continue happening into the near future.
E. horridus is now extinct in several parts of its former range where it has been totally eliminated by urban development. Substantial numbers have also been removed by collectors in the past 50 years. It is difficult to estimate what proportion of plants have disappeared but it could be as high as 50%.