very. carefully.
i'm with mike; i get 'em to phototrope in the opposite direction from where i ultimately want them to be, then i turn them 180 degrees so they go the other way. i use regular garden stakes for the big tall ones and tie tapes or butterfly clips depending on how mature the spike is.
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http://www.oneplusyou.com/q/v/caffeine
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"Apart from the utility of binomials for standardizing reference for effective communication,
Laelia Speciosa is a tad easier to pronounce and spell than its Atzec name
chichiltictepetzacuxochitl."
--Alec Pridgeon