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A student
conducted an experiment that used two rose plants to determine if a liquid formula for fertilizer was better than a dry formula. He tested each fertilizer on a single plant for one , and he concluded that the liquid formula was better. When he described his conclusion to his , she told him he needed to conduct additional trials. The most likely asked for additional trials because

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ItsYeQueerKid
He needed to make the conditions the same for both plants and use one product on one plant and the other product on the other plant.

Answer:

A scientific experiment is designed in a way that it includes all the variables to be tested as well as the control group.

In the given question, the student performed the experiment to test if liquid fertilizer is better than dry fertilizer or not?

So, to test this student performed the experiment on a small sample size that is only one plant and lacked a control group which could act as a reference to the experiment.  Therefore the additional trial should include a large sample size to remove the error and the control group which provide data to compare.