Hypothesis:
Alex wants to grow some flowers for his wife, but isn’t sure which flowers will grow best in the soil in their yard. He goes to Lowe’s and buys hydrangeas, roses, daisies, and tulips. He sections off the soil into four equal parts and plants each type of flower in their own section. All flowers receive the same amount of sunlight throughout the day and he waters them all the same amount and at the same time daily. He records the growth of the flowers
once a week for a month.

I have a similar problem for my science class, but it's worded a little differently. I would say that a possible hypothesis is if (one type of flower) is planted alongside (another type), (one type of flower) will grow the best in the soil.

Explanation:

Since there are more than two things being tested, and the comparative stuff isn't known, you kind of just have to pick one. That's the best I could think of. Hope this helps!!!