Record all information or data you have about the growing conditions of your plants, for instance you can take readings of the daily temperature, humidity and light.
The more readings you take, the better your information will be for analysing your investigation results and drawing conclusions for your research paper / poster.
Describe these conditions in detail, so we can understand what your measurements were about.
Ideally, everyone should conduct the research under the same conditions but it is difficult to maintain the same temperature, humidity or lighting levels across all the schools in New Zealand. To be able to make a comparison between all the seeds grown in schools, it is a very good idea to write down as much as you can about your particular conditions.
All collected data should be recorded regularly in a personally designed data logbook or using a data sheet.