Cool growers in the windowsill
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Old 12-23-2015, 12:36 PM
MCSchrum MCSchrum is offline

Join Date: Oct 2013
Zone: 6a
Location: Missouri, USA
Posts: 40
Cool growers in the windowsill Male
Default Cool growers in the windowsill

I've got a question for you veteran windowsill growers out there. Have any of you had success with blooming cool growing orchids, or orchids that require a cool dry winter rest? I have several orchids that fall into these categories, and so far I have had minimal success in blooming them, though they grow just fine.

I believe the problem is that I haven't been able to keep them cool long enough to initiate blooming. During the fall, I keep the windows open in my growing room as long as the night time temps stay above 40 or so. Below this, it is just too cold, and I have to close the windows. I eliminate fertilizer to these plants, and reduce or stop watering, so I don't think that is the issue.

I have 2 T5s and an LED lighting fixture, and they produce a fair amount of heat. It's been pretty warm in MO so far this fall, and during the day, the temps in my growing room can get up into the low 80s F. I've got 2 oscillating fans to keep the air moving, but this doesn;t reduce the overall temp in the room. My intermediate and warm growers bloom just fine. Has anyone had more success with their cool growing orchids indoors?

The plants I'm growing include:

Dendrobium kingianum
Dendrobium loddigesii
Dendrobium unicum
Coelogyne cristata
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Old 12-23-2015, 01:00 PM
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Subrosa Subrosa is offline
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Join Date: Jul 2013
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Location: PA coal country
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Cool growers in the windowsill Male

I'm in the same position as you with kingianum and loddigesii, but my unicum has bloomed twice for me. It doesn't get a cool anything, I keep it above 60F at all times. Right now it's in growth, so I water daily ( the plant is mounted) with rain or ro to which I add 1 tsp MSU per 5 gal. It just started a new cane, but I suspect it will be the last of this growing season. When the leaves start to yellow I cut back the watering to every other day and eliminate the ferts. When the leaves have dropped I water about weekly until spikes develop when I start increasing water. When new canes start I resume fertilization. Currently the plant is under moderately bright led lighting, but as soon as long as night time temps stay over 60 it's outside in very bright indirect lighting. Adding link to pic of mine in bloom: Dendrobium unicum
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Last edited by Subrosa; 12-23-2015 at 01:32 PM..
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Old 12-23-2015, 01:31 PM
Yazz Yazz is offline
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Join Date: Jun 2015
Zone: 9a
Location: Texas
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Cool growers in the windowsill Female

I'm a windowsill grower with no lights. Understand your concern about how warm a winter this is. I live outside Houston and temps here are 75f during the day dropping to 60f at night.

Have one Dendrobium Proud Appeal, a bunch of neos who need a dry rest, and phals. All need a cool rest, except any who are still growing. When a cold front comes through, they all go in a unheated room with a window. We've only had one cold front and hoping another one comes soon.

Last edited by Yazz; 12-23-2015 at 01:34 PM..
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