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The Cactus Thread

This thread features a comprehensive discussion on growing, identifying, and propagating cacti and succulents, highlighting community observations, practical troubleshooting, and individual species behavior.
  • Cold Hardiness Limits: Community members noted that several species, including Oreocereus celsianus and cold-tolerant Echinocereus varieties, can survive extreme freezing temperatures down to 0°F (-18°C) as long as their soil remains completely dry throughout winter.
  • Water Therapy Propagation: A specialized method of suspending rootless or severely dehydrated cacti like Astrophytum over water with rubber bands was praised for encouraging rapid root initiation within just a few days.
  • Lighting and Dormancy Requirements: Members cautioned against placing desert cacti in dark indoor rooms or relying solely on basic grow lights, emphasizing that full sunlight and a cool winter dormancy period are necessary to induce blooming.
  • Pest Management Practices: Effective solutions for mealybugs include direct application of isopropyl alcohol and systemic insecticides, while using volcanic ash grit helps prevent sciarid fly larvae infestations.
Updated: AI Thread Summary
Zigs said:
Yep, if in doubt use rain water for cacti, there's more of them that don't like hard water than those that do so it's easier to add lime to the compost where needed 🙂

I just put a page on my website to promote the Cactus Club...

Click to expand...
Hey that’s awesome we defo need more like minded people, I’ve learnt so much talking to your self and Lyn and it’s nice to have some one where you can reach out to whilst one is learning if they get stuck 😁🌵🌵🌵🌵
 
Zigs said:
He's been out in the frost today on the outside cactus bed

View attachment 2609

Meanwhile inside the cactus house this Austrocylindropuntia vestita is snuggled up to the Cleistocactus 🙄

View attachment 2610
Click to expand...
I bet captain Neem oil was cold out there today, ha ha I bet the Austrocylindropuntia is thinking hey you got a nice warm fleece coat on let me get in there and keep warm oh my soooo funny gotta love a cactus with a funny personality 🤣😁🌵🌵🌵
 

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