The words in the template (the part at the top) should be capitalized. It is preferred that you do not space out the top template. (See Hydromancerx's submission above for a good example on how to format a good submission.)
There's a lot of white space to the right in the image, which should be trimmed out.
I am not sure whether island gigantism should apply to Barlowe. Certainly, it is a small island now, but it didn't suddenly (geologically speaking) arise from the ocean. It was formerly a large continent, but most of it is now submerged. It may be comparable to Zealandia, the largely-submerged continent that only has New Caledonia and New Zealand as above-water parts.
It is thought island gigantism occurs from a lack of competition for particular niches, and there are already fairly large flora: the Obsidian Shrub: (50 cm tall), the Rainforest Carnofern: (60 cm tall), the Barnline (1 m wide, estimated height: 50 cm tall) and Obsidibarrage. (6 m tall; necessarily passes through 1.5 m and similar ranges while growing). Doesn't it make more sense that the Obsidian Shrub should get three times bigger, or the Obsidibarrage would shrink, then a Sunstalk should get 10 times bigger when there would be competition for that size range? (see the smaller flora of the island)
The first two sentences are breathless. You should add commas, and split it up into more sentences. I would recommend adding a little more detail, although similarly minimal descriptions do have precedent in the Alpha timeline. (e.g., the Crowned Kingrush)