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Cacti Identification

Leannedickens.nLeannedickens.n Posts: 3
edited May 2018 in Plants
Hello.

Can someone help me to identify these baby cacti? I'm new to the cacti world and they all look the same to me when I try to find them online  :s









I also have a what I believe to be a Blue Myrtle...?



Thank you  :)

Leanne

Posts

  • hogweedhogweed Posts: 4,053
    I grew lots of cacti years ago and the memory isn't so good now but the one on the right of the 3 is an Opuntia. The one in the middle could be Trichocereus and the one on the left Echinocactus - possibly. The bottom one could be a Trichocereus as well.

    Best to get a beginner's guide book to read up on them if you are keen.  
    'Optimism is the faith that leads to achievement' - Helen Keller
  • Paul B3Paul B3 Posts: 3,154
    Picture 1 ; left to right = (1) Mamillaria nejapensis (2) Trichocereus spachianus (3) Cylindropuntia imbricata , as far as I can tell !!
    The 'bluish' cactus in the bottom picture looks like Stenocereus pruinosus .

    https://cactiguide.com/

    This can be helpful and interesting .




  • Paul B3Paul B3 Posts: 3,154
    Re:- the bluish cactus in bottom photo ; maybe you're  thinking of Myrtillocactus geometrizans .
    This is a rapid growing very blue stemmed multi-branched species which bears white flowers strongly scented of Myrtle !

    Keep an eye on the Mamillaria on the left of pic.1 ; looks like stem-rot developing .
  • Leannedickens.nLeannedickens.n Posts: 3
    Paul B3 said:
    Picture 1 ; left to right = (1) Mamillaria nejapensis (2) Trichocereus spachianus (3) Cylindropuntia imbricata , as far as I can tell !!
    The 'bluish' cactus in the bottom picture looks like Stenocereus pruinosus .

    https://cactiguide.com/

    This can be helpful and interesting .




    That looks about right to me. Thank you :) I now have 3 more i need help with :D






    All need repotting.

    Thanks
  • Leannedickens.nLeannedickens.n Posts: 3
    Paul B3 said:
    Re:- the bluish cactus in bottom photo ; maybe you're  thinking of Myrtillocactus geometrizans .
    This is a rapid growing very blue stemmed multi-branched species which bears white flowers strongly scented of Myrtle !

    Keep an eye on the Mamillaria on the left of pic.1 ; looks like stem-rot developing .
    How can you spot stem rot? What should i be looking for?

    Thanks
  • Paul B3Paul B3 Posts: 3,154
    Hello again Leanne!

    Stem rot on cacti usually appears as a blackish area on the stems ; in particularly bad cases , a dark liquid can be exuded .
    On a columnar plant it can sometimes be cut out and the stem left to callous over ; in clump forming species like Mammillarias the centre of the cluster can be affected which often indicates the ultimate demise of the plant in question .

    Overwatering in winter (need virtually none from October-April) , and should be kept at around 10 C for this period . High atmospheric humidity is another factor which can cause this .

    Your plant IDs ; left to right .....1) Ferocactus latispinus var. flavispinus.
    2) Maybe  Opuntia robusta 'Monstrosa' ; very variable plant , difficult to be precise!
    3) Again great variation here , but looks like Mammillaria nunezii ssp. bella .
    Looking at the growing medium in those pots , I would be inclined to carefully wash off all that organic stuff and repot in a gritty/sandy mix , and then liquid feed throughout the summer .
    A sunny conservatory of greenhouse would be ideal .

    Good luck with them all!!






























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