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Author Topic: Growing Trichocereus Cacti Under Lights?  (Read 67 times)

Mark_Antony

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Growing Trichocereus Cacti Under Lights?
« on: November 08, 2019, 06:29:25 pm »

Hey fellas im interested in possibly growing my Trichocereus cacti under lights but im not sure what the best choice would be or if its even possible. I have found mixed information online and i cant seem to get a straight answer on what light would be the best. Im currently growing my 1 year old seedlings under lights but i know they will need something more powerful when they begin to grow bigger, So any information you guys can provide on growing them under lights would be helpful.
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Auxin

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Re: Growing Trichocereus Cacti Under Lights?
« Reply #1 on: November 08, 2019, 08:02:02 pm »

The stronger and more 'natural' the light, the better. But make any large changes slowly.
Once they have grown under the sun for a time its best to just make them go dormant all winter unless you dont mind etiolation.
If your starting up seedlings or plumping seedlings up on pereskiopsis the 'daylight' spectrum CFLs work well for indoor lighting and are affordable.
Beyond that, anything that could grow cannabis indoors could grow cacti indoors, with notable etiolation.
If your cacti will never be grown under the sun or if you dont care about a sinusoidal shape of the stems just give them as much 'daylight' spectrum light as you can and dont go too nuts with fertilizer, as softer growth may be more susceptible to rot.
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Mark_Antony

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Re: Growing Trichocereus Cacti Under Lights?
« Reply #2 on: November 08, 2019, 08:39:00 pm »

So by daylight spectrum do you mean in the around 6400 kelvin range?
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Auxin

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Re: Growing Trichocereus Cacti Under Lights?
« Reply #3 on: November 09, 2019, 07:32:14 am »

Yes, 5000-6500+
They should say 'Daylight' on the box.
And please, dont use one as your porch light, those things are blinding at night ;)
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geezer

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Re: Growing Trichocereus Cacti Under Lights?
« Reply #4 on: November 10, 2019, 05:50:11 pm »

give some thought to how tall your columns are and how-to light with what kind of fixture

light gets weaker as it gets further from the source. it takes a badass bulb with a strong power source to light well from 6 inches down to six feet down. I learned this in my hydro vegetable garden. you can burn stuff too near the bulb and get poor performance from things too far from the bulb

if you were trying to use a small cfl bulb to light a two foot tall column from the top you'd not get good results. those cfl's meant for growing lettuce in a hydro pot (for example) are only intended and capable of lighting for a few inches

it would be great to light evenly from top to bottom. so maybe a 2 foot long flourescent fixture fitted with daylight bulbs standing on it's (narrow) edge would light tall columns best. I'd guess a four bulb fixture could light 6 or 8 columns of 3 feet tall or less

and you'd have to give some thought to either rotating the pots so the columns get even light, or have a second fixture on the other side of the columns but I'll confess that's getting a bit anal

maybe a qualified horticulturalist has an opinion about the right or wrong of lighting from the side instead of the top. they get lit mainly from the top out there in nature so maybe there's a consequence to side lighting???
« Last Edit: November 10, 2019, 05:57:07 pm by geezer »
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all about the cactus

geezer

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Re: Growing Trichocereus Cacti Under Lights?
« Reply #5 on: November 10, 2019, 05:51:15 pm »

if there's a hydroponics store near you they'll be your best friend on figuring this stuff out

and another thing learned from the hydro vegetable days - running lights is expensive. try to get the best use out of every fixture. If you could grow some lettuce in the voids between round pots you'd be helping amortize the electric bill.
« Last Edit: November 10, 2019, 05:54:22 pm by geezer »
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all about the cactus