Hopefully someone with more knowledge with dendrobiums might help also. It would be helpful if you knew what kind of "dens" you have. Some need winter rest and colder nights others are treated differently. I got this info from this site back in January:
As classified by Rebecca Tyson Northern, there are 6 groupings that describe the differences in growing needs of Dendrobiums. I am paraphrasing to avoid copyright infringement.
Type I (deciduous, so-called nobile type) intermediate to warm in summer, cool to cold in winter, full winter rest. Examples: D. nobile, D. chrysanthum, D. wardianum.
Type II (deciduous) intermediate to warm all year, full winter rest. Examples: D. speciosum, D. aggregatum, D. findlayanum, D. heterocarpum, D. superbum (anosmum), D. parishii, D. pierardii.
Type III (persistent) intermediate to warm summer, cool in winter, no winter rest - simply reduce water. Examples: D. densiflorum, D. fimbriatum, D. thyrsiflorum, D. farmeri.
Type IV (persistent) cool all year. Short suspension of water early autumn. Examples: D. bellatulum, D. secundum.
Type V (persistent) Intermediate all year. No rest. Examples: D. antilope and hybrids of type V and type VI.
Type VI (persistent) warm growing all year. Restrict water twice during year. Examples: D. phalaenopsis, D. bigibbum, D. superbiens.
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Donald
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