Hydrangeas are a type of plant whose flower clusters can be as large as your head. the flower color can be changed by altering the ph of the soil. acidic soil produces pink flowers and neutral or slightly basic soil produces deep blue flowers. an experiment was conducted growing 20 hydrangeas using soil with a ph of 4.5 (acidic) and another 20 in soil with a ph of 7.0 (neutral). scientific writing which statement is one of fact supporting how ph and flower color are related? which statement shows a reasonable conclusion based on the data? in the test, 16 plants out of 20 turned pink in soil with a ph of 4.5, and 15 out of 20 turned deep blue in soil with a ph of 7.0. the results show that pink flowers mean you have soil with a ph of 4.5, and blue flowers mean you have soil with a ph 7.0.