You may have a mite problem if you are getting brown scabby patches forming. Otherwise, how close is it to the lights, and how hot and bright are they? For a point light source, if you halve the distance to the light, the light intensity goes up by 4x; go 10x closer and the intensity goes up by 100...

Is this a Graft? The lower part looks way undersize in diameter. If it is a graft, are the base roots ok? Mike M The narrow part at the bottom is the way it grew on alkaline tap water. My profile picture is that same cactus outdoors getting rain water. I'm going to repot the main column today or to...

This was brown and scabby looking when watered with hard alkaline tap water and sometimes Jack's Classic. It added healthy green growth when I put it outside in May. The healthy growth continued since I brought it inside and switched to hard tap water adjusted to pH around 6 and Dyna-Gro at 2 ml per...

Different people are comfortable with different levels of privacy. Nothing should be mandatory but something about their climate would be relevant if they are seeking advice about outdoor plants.

Yes it is. And the seller threw in a couple seedlings on their own roots.

I bought an Opuntia with two Echinopsis scopulicola seedlings grafted to it and one broke off in the mail. Is a 1-1/2 inch piece like this too small to root? I have something I can try to graft it to otherwise.

Stratify in the freezer six months and you should be good to go. If anyone has any advice how to grow seedlings once they've germinated though, let me know. ](*,) Keep them in a humid environment but don't let mold grow! I'm just now getting mold in a tray that had none since I started it in late S...

There was a disease called "Foolish Seedling Disease" caused by gibberelins produced by fungi in the soil. I got 5 grams of GA3 and have no way to weigh a smaller amount accurately. I decided to make a stock solution of 1 liter at 5g per liter and add 1 ml of that solution to 100 ml of wat...

For a new tray of mixed Southwest desert and Andean species I have two clamp lights with 13 watt bulbs. The bulb on the left one is 11 to 13 inches from the soil surface. It's visibly dimmer from my first tray about 12 inches from two T5 tubes shaded by tissue paper. Are my seedlings going to be eti...

Can they be reproduced by grafting aereoles and then removing the scion and rooting it once it has grown large enough?

I started a bunch of seed 3 days ago and I was surprised Astrophytum myriostigma v tamaulipense, Astrophytum coahuilense and Astrophytum asterias are germinating already. Is a 2 foot 4 tube T5 fixture with 2 slots empty and 1 each of Spectralux 6500k and 3000k tubes 10-1/2 inches from the soil surfa...

ElieEstephane wrote: ↑Sun Sep 15, 2019 7:26 am It's stenocereus pruinosus. The ones in the back are ferocactus glaucescens and echinocactus grusonii

Thanks. Now that I've looked into this genus I'm really interested in Stenocereus beneckei. That one is much harder to find.

I grab these whenever I see one. I love the symmetry, color and fast growth.

How about the ones in the background? Two other favorites for shape and spination.

If you try concentrated acids like battery acid be careful, particularly diluting it and wear goggles, also keep a bucket of water handy to wash off any spills, preferably don't use concentrated acids. See also:- http://seedscactus.com/en/content/62-comparison-between-treatments-of-cactus-seeds-awa...

I'm interested in cold hardy cacti and picked up some Pediocactus simpsonii seeds. A lot of sources say to stratify outdoors in early spring. I'm eager to get these started though. One person suggests chipping the seed coat with a pin and I'm thinking of trying that. [youtube]https://www.youtube.com...