If you can't think of any direct way in which it is relevant, it probably doesn't belong in your paper. Sundews - Specifics about their biology, natural history, mineral nutrition. A brief review of any studies that have looked at size-selective foraging is appropriate, whether they deal with fish or not. The active voice contains more information.
Chronological sequence is a commonly used method.
Include sufficient detail that someone else could repeat your experiment with the essentials of the design the same, including the time and location of the study. Don't include procedures, activities that are a normal part of all scientific studies and can be assumed to have occurred. Use past tense. Sundews in the treatment group grew slower than those in the control group. Do not interpret the data or draw generalizations.