For a while, the only notably tall flora in Dingus Forest have been the Canarpines - females standing over nine meters high; but as with their tropical cousins, they would become dwarfed by stands of nomflora trees, capable of sustaining much greater heights. In these cool continental climes, such stands consist of Plumboak - offshoots of the Mockanary Shrub.

The Plumboak retains many traits common to other plumbos, such as a hard, woody trunk reinforced with lead, and foliage which grows in repeating layers; in many other aspects however, the Plumboak is quite different. Perhaps originating as a mutation induced by radiation, as its trunk ascends, it splits off into branches which then produce separate whorls of foliage; this ensures to maximize its photosynthetic area wherever it grows, as it will need the many sugars manufactured to support its immense form. Long, deep roots not only help the Plumboak access nutrients (facilitated by symbiotic Nitropellets) and water, but to provide sturdy anchorage to the ground. Plumboak foliage is dense and vivid cyan in the summer, gradually shifts to purple then mauve-taupe by autumn, sheds completely by winter, and re-emerges in the spring followed by the development of flowers. As a descendant of the mockanary, the Plumboak employs male canarflora to pollinate its golden flowers - a male picks up gametes from one flower and dispenses them with the next flower he meets. However, wind dispersal at this point is too inefficient to carry Plumoak spores far from their parents, so fauna must also be used for spore transfer. Spores are concealed in a seedy coat, which in turn is enveloped deep within a thick, sugary casing - a fruit. The bold ochre color of a ripe fruit is appetizing to a passing Titurdle, which gladly eats it. Most spores survive passing through a Titurdle’s gut, and with the excrement they ride in, spores can often get a nutritious headstart at growth.

Plumboaks can be found throughout the good majority of Dingus Forest, either forming dense stands in wetter areas, or in sparser, more spaced stands in drier, steppe-like areas. Such trees found in the latter often spread their foliage wider than shoot them high, that being a common growth pattern among sylvain Plumboaks. The floor of Plumboak forests is usually spaced with frequent patches of light, unlike the more uniform shadow of Nomboo jungles. Due to the resources they need to develop, Plumboaks are late-succession flora.