Hi, Vickie: Assuming that your plant does not have some sort of disease or pest (inspect carefully; if so, do online research) and you have not just totally drowned your hydrangea (it should be moist, not swamped), it would seem that heat might be a possible culprit as the cause of your brownout. Sometimes folks equate heat with sun, but the two aren’t the same. Perhaps your kitchen has just been too warm for it. In any event, sure, go ahead and plant it outside as long as you are not in the far north (find your last frost date here: http://www.almanac.com/gardening/frostdates). Snip off the brown blooms and go for it. Be sure to read all the advice above. Good luck and thanks for asking!
Hi, Vickie: Assuming that your plant does not have some sort of disease or pest (inspect carefully; if so, do online research) and you have not just totally drowned your hydrangea (it should be moist, not swamped), it would seem that heat might be a possible culprit as the cause of your brownout. Sometimes folks equate heat with sun, but the two aren’t the same. Perhaps your kitchen has just been too warm for it. In any event, sure, go ahead and plant it outside as long as you are not in the far north (find your last frost date here: http://www.almanac.com/gardening/frostdates). Snip off the brown blooms and go for it. Be sure to read all the advice above. Good luck and thanks for asking!