Tarev yes that happens, changing from one environment to another, anything stressing the plant can bring on blooming. But I didn't mean about the bloom (it isn't anything that special) but the mature plant right before blooming is truly amazing! This is my first year with so many 3 year old plants (many of them blooming) the size and colors though have been so cool!!
Paul - that is funny! Good idea about terra cotta pots! Odd that Lemon balm which is a total weed here doesn't do to much there~ it is just like mint here, or bamboo!! People warn you about not planting certain things and lemon balm is always one on the list!