What Blue Cactus am I?

If you have a cactus plant and need help identifying it, this is the place to post it.
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mikethecactusguy
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What Blue Cactus am I?

Post by mikethecactusguy »

What Blue Cactus am I?. I have spent a long time on Llifle looking through everything
295456006_10216942851362407_8419855798346252205_n.jpg
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greenknight
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Re: What Blue Cactus am I?

Post by greenknight »

Echinocactus platyacanthus? Probably wrong, but I took a shot.
Spence :mrgreen:
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mikethecactusguy
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Re: What Blue Cactus am I?

Post by mikethecactusguy »

Thanks Spence.. Looks spot on
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mmcavall
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Re: What Blue Cactus am I?

Post by mmcavall »

Agreed. Quite Blue this one!
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Re: What Blue Cactus am I?

Post by mikethecactusguy »

I think its wild that it turns into this..
Echinocactus_platyacanthus_24249_l.jpg
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mmcavall
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Re: What Blue Cactus am I?

Post by mmcavall »

Indeed.
It is amazing to see how many ribs it has to add to reach full size. Smaller species have a higher number of ribs since they are young. The bigger the species, the number of ribs will be smaller when young (right? thats something my little platyacanthus made me think, not sure it is correct).
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anttisepp
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Re: What Blue Cactus am I?

Post by anttisepp »

This group is among my favorites. They need much space for roots, much sun and regular watering in summer, fertilizers also suit fine. Fast grower in optimal conditions.
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mikethecactusguy
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Re: What Blue Cactus am I?

Post by mikethecactusguy »

Thanks guys for the help..
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K.W.
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Re: What Blue Cactus am I?

Post by K.W. »

Hi Mike,

not sure but. . . Ferocactus emoryi


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Tom in Tucson
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Re: What Blue Cactus am I?

Post by Tom in Tucson »

K.W. wrote: Sun Aug 07, 2022 3:52 pm Hi Mike,

not sure but. . . Ferocactus emoryi


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loyall
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Re: What Blue Cactus am I?

Post by loyall »

K.W. wrote: Sun Aug 07, 2022 3:52 pm Hi Mike,

not sure but. . . Ferocactus emoryi


K.W.
I am just a novice, but when I looked up K.W's suggested ID on cactiguide.com the first photo seems to closely resemble Mike's photo, except that it is not blue. Any chance the cactiguide photo is a mis-identification?
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Aiko
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Re: What Blue Cactus am I?

Post by Aiko »

anttisepp wrote: Fri Jul 29, 2022 10:20 pm This group is among my favorites. They need much space for roots, much sun and regular watering in summer, fertilizers also suit fine. Fast grower in optimal conditions.
And quite hardy, from experience. I have about 15 to 20 plants of Echinocactus platyacanthus / E. visnaga (what is the difference, by the way?), sown somewhere 20 years ago. They are grown hard, and still just 8 centimeters in size. But they have survived the last few years in an unheated greenhouse in the winter. This includes the one with the severe cold of february 2021 when it got around -15C for a few nights. I have lost just one plant, but that could have any reason.
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mikethecactusguy
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Re: What Blue Cactus am I?

Post by mikethecactusguy »

If you look up on Llifle the pictures do match. Echinocactus platyacanthus.
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BryanT
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Re: What Blue Cactus am I?

Post by BryanT »

Agreed it's E. platyacanthus.
They can be quite blue when young, had seen them in a friend's nursery.
Here is the picture for young E. platyacanthus (on the left) and F. emoryi.
Can see the different colours of the spines.
E platyacanthus F emoryi.jpg
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