Closed red buds and open yellow flowers show the perianth colour contrast common in Aloe microstigma. Perianth length is around 2,5 cm to 3 cm.
The shiny, cylindrical flower formed by two whorls of three perianth segments each is often slightly swollen around its midsection. The outer three segments are free to the base. They have three to five nerves that are green near the slightly spreading, pointed segment tip. The inner segments are free and not cohering with the outer ones. Their tips are obtusely pointed and spreading.
The anthers and stigma become exserted shortly after the perianth mouth opens. The inner three stamens lengthen first, pushing their anthers out early. The outer three follow by the lengthening of their filaments to take their place outside the older flower, enhancing the pollination probability by thus extending the pollen presentation period (Reynolds, 1974).