Effect of cultivar on plant height

An experiment was conducted to compare the differences in growth among four different cultivars of a house plant. The greenhouse had three benches in different locations which form natural blocks. Two pots of each cultivar (replicates) were randomly assigned to each bench for a total of six pots per cultivar and eight pots per bench.

       Bench                   
1 B
19.4
D
16.6
D
15.7
C
17.4
A
17.2
B
20.1
C
16.6
A
19.3
2 A
15.5
C
14.4
B
20.8
A
16.7
B
21.2
D
12.9
C
13.6
D
13.5
3 C
17.4
D
12.8
A
17.7
B
21.9
C
15.8
D
14.7
A
19.8
B
20.0

Note that the results may be reported without specifically mentioning the details of the randomisation on the benches:

  Cultivar
       Bench           A       B       C       D   
1
19.3
17.2
20.1
19.4
17.4
16.6
16.6
15.7
2
16.7
15.5
21.2
20.8
14.4
13.6
13.5
12.9
3
17.7
19.8
21.0
21.9
15.8
17.4
12.8
14.7