Evolutionary history of plants phloem on the outside. Since xylem cells comprise dead, lignified tissue, subsequent rings of xylem are added to those already present, forming wood. The first plants to develop secondary growth and a woody habit, were apparently the ferns, and as early as the Middle Devonian one species, "Wattieza", had already reached heights of 8 m and a tree-like habit. Other clades did not take long to develop a tree-like stature. The Late Devonian "Archaeopteris", a precursor to gymnosperms which evolved from the trimerophytes, reached 30 m in height. The progymnosperms were the first plants to develop true wood, grown from
Seedsman Seeds cannabis. In 2016, Seedsman released a high CBD seed collection, recognising the potential therapeutic use of Cannabidiol. Seedsman Seeds Seedsman Seeds is a company based in Spain, which markets cannabis seeds online. The company was founded in 2003. As well as selling 1500+ cannabis seeds from over 100 seedbanks worldwide, Seedsman have established their own brand of seeds, including Feminised, Regular and Autoflowering cannabis strains. In 2007, Seedsman launched their Feminised cannabis seeds range, which included popular strains such as White Widow (Cannabis), Original Skunk, Early Skunk and Power Plant. Seedsman continued their expansion into the industry by releasing their