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
McKenzie Seeds McKenzie Seeds McKenzie Seeds is a seed packaging company which has over 200 employees and is based in Brandon, Manitoba. It was established in 1896 by Dr. Albert Edward McKenzie, and is now Canada's foremost seed supplier with 60% of the market. Its retail division sells seed under the brands McKenzie, Thompson & Morgan, Gusto Italia, and Pike, as well as other gardening products and accessories. Through a direct mail division it operates the brands McFayden and McConnell catalogues. In 1945, 90% of the company shares passed from its founder to the Manitoba Government to benefit Brandon College, the forerunner