Answer: The 10th row has tullips
Explanation:
You can do it in a next way: 
the first row has tulips 
the second row has roses 
the third row has daises. 
then the numbers: 
1 + n*3 where n is an integer, are rows with tulips. (1, 1 + 3, 1 + 6, and so on) 
2 + n*3 are rows with roses 
3 + n*3 are rows with daisies. 
Then the row number 10 is equal to: 
1 + 3*3 = 10 
so this is one of the rows that have tulips.