How many replicates did you sample? Ten replicates in total were samples.
Have you had any problems implementing your sampling design? A larger area would have been more practical to implement the sample design. It would have been easier to identify percent sunlight plant was exposed to.
Have you noticed any ancillary patterns that make you reflect on your hypothesis? An additional pattern that makes me reflect on the hypothesis is that the Trofolium is growing in pine needles which makes me think that soil acidity is also a contributing factor to plant condition.