It seems that part of your question is missing, but I can answer what I understand.
If a gardener plants 1/2 of a row of each type of pepper and she has 4 rows available for planting, then she can plant a total of 2 x 4 = 8 different types of peppers.
To see why, consider that she is planting 1/2 of a row for each type of pepper. This means that for each row, she is planting 1/2 x 1 = 1/2 types of peppers. Therefore, for 4 rows, she can plant 4 x 1/2 = 2 types of peppers.
So, the gardener can plant 8 different types of peppers in total.