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
Burpee Seeds Burpee Seeds Burpee Seeds, officially W. Atlee Burpee & Co., is a seed company that was founded by Washington Atlee Burpee in 1876. The company is not named after a relationship to "burpless" cucumbers. The company first sold garden seeds, farm supplies, tools, poultry and hogs. The direction of the company began to change with the death of its founder in 1915, when his son, David Burpee, inherited the firm. David was interested in war or victory gardens and was an early promoter of the concept during World War I. He also prioritized in flowers and initiated several flower breeding