Very full and bushy plant with many leaves and smelled nicely. Switched to flowering stage by changing the lights to 12/12 (2700k). Two day later, the plant leaves were drooping, curling inwards, drying out and tips were turning black. Other leaves were a bright green and now almost yellow. During veg stage plant was getting PH'd water and mixture of Grow Big and Big Bloom. On 5/9 plant got mixture of Tiger Bloom and Big Bloom.
The most distinctive cells found in xylem are the tracheary elements, that is tracheids and vessel elements. However, the xylem is a complex tissue of plants, which means that it includes more than one type of cell. This is why it is a tissue not a cell.
There are four types of xylem cells: 1  Xylem vessels: Consist of dead hollow cells because the walls are lignified and the cell contents disintegrate. 2  The lignin makes the cell wall impermeable so they are in effect waterproof. 3  It also makes the vessels extremely strong and prevents them from collapsing.