<italic>Hydrangea macrophylla</italic> ‘Verena’ and ‘Moonstar’ were tested in the heated and the non-heated greenhouses to accelerate the flowering period. Compared to ‘Verena’ that have been continuously grown in the bare ground, ‘Verenas’ moved to the non-heated greenhouse have bloomed about a month earlier. Compared to the ‘Moonstar’ that has been left in the bare ground, the ‘Moonstar’ moved to the heated greenhouse, bloomed about two months earlier. Applying this, it seems that if the farmhouse installs a separate facility and warms it up, it will be able to help the farmhouse economy by harvesting flowers during the off-season. ‘Moonstar’ and ‘Moonlight’ grown in the heated greenhouse, where the conditions for flowering buds do not fit, were moved to the bare ground, the heated greenhouse, and the non-heated greenhouse, respectively. Although all individuals bloomed, deformed were shown in ‘Moonlight’ kept in the heated greenhouse, and deformed flower buds formed in ‘Moonlight’ moved to the bare ground. This was not a normal flower bud differentiation condition, so it appears that deformed flower buds were formed. Looking at the results of differentiation between ‘Moonstar’ and ‘Moonlight’, it is expected that ‘Moonlight’ has a slower flowering period than ‘Moonstar’ due to the nature of the species.