The 'Hydrangea macrophylla' Bodensee '' is a beautiful bulb hydrangea that blooms rose red or blue. This hydrangea needs no maintenance, just like all other bulb hydrangeas. The 'Bodensee' blooms in July, August and September and is hardy. This plant prefers a spot in the partial shade or in the sun and does not really matter much. The acidity of the soil can influence the flowering color of the flower.