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OfflineI AM SWIM
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San Pedro -- Black Spot @ the tip.
    #14148183 - 03/19/11 12:16 PM (12 years, 11 months ago)

So I have about a meter long san pedro growin' and it's been inside because of the cold winter, and hasn't gotten much sun for a couple of months.

Lately the sun is shinin' and I was wondering is that the cause of a black spot at the very tip of the cactus?

Should I just leave it alone? It's having fun in the sun right now,

I'm not sure if it's best to leave it alone, or cut that black spot on the tip off?

I want this one to grow and flower eventually, so IDK if cutting it would cause it to stop that?

What do you think is the cause of this black spot? lack of sun??


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Offlinefungivore
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14148421 - 03/19/11 01:31 PM (12 years, 11 months ago)

I harvested my Pedro last year and, as a result, it started branching out. It has been inside all winter like yours, and one of the little branches was getting black at the tip also like yours. However, mine started turning black before I put it outside from its winter dormancy. It was soft to the touch so I went ahead and cut it off.

I'm also curious to hear what other experts say about this.


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Offlinewaixingren
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14148504 - 03/19/11 01:49 PM (12 years, 11 months ago)

I AM SWIM  can you post a picture of the black spot? is it squishy? it could just be a sun burn


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OfflineGGTBod
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Re: San Pedro -- Black Spot @ the tip. [Re: waixingren]
    #14148979 - 03/19/11 03:10 PM (12 years, 11 months ago)

It sounds like die-back, this is caused in one of 2 ways from what i have learned so far through my experiences and sharing them with people across the net especially on el Shroomery.

1
As dormancy was about to occurr the the cacti still has too much nutrient/water for how much light it is getting.

my solution
i live on the 55th paralel north, my dormancy triggered by myself is started at the start of november and ends in april, this is to match the change in amount of sunlight, througout october i reduce the amount of fluid i give each cacti and none of that fluid has nutrients added, the last liquid is at start of november and it is way less than half of a normal in season watering. At the same time i also move away from the full light at my south facing windows gradually into a more shaded area of the room where they still get daylight. Throughout march i do a reverse of this to avoid any splitting after 5 months without water, this is done for my pedros and peyotes

2
almost the opposite, not enough food/liquid to match how much light they are getting,

solution is if they get more than 12 hours bright daylight per day they will want some liquid/nutrients

These problems and solutions are from my experiences this far north on the globe (fucks sake ladies and gentlemen im level with Alaska) anyway you may not need as long a dormancy period as i do.

Also any that have died back it is best to cut off the tip removing all black plant material the soft and crispy depending on which version of dieback you've caused making sure you leave no black, it will grow new limbs, it is best to cut the tip off before the new watering/growing season and then you have the whole new season to grow.

Post some pics up

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OfflineI AM SWIM
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Re: San Pedro -- Black Spot @ the tip. [Re: GGTBod]
    #14150514 - 03/19/11 08:28 PM (12 years, 11 months ago)

Thanks for the info everyone.

The black spot is really small and only at the top, and I tried touching it to see if it was 'squishy and soft', and it's kinda in the middle. :shrug:

It feels like it's getting softer, probably as time progresses, but so far seems pretty hardy.

I'll get some pics up by tomorrow, and more detail about the soil I'm using. I guess this could be a sign of a nutrient burn of some sort. Anyway, I got a bunch of thangs I gotta be doin'.

Thanks again.

:feelsgoodman:


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OfflineEnvix
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14150842 - 03/19/11 09:30 PM (12 years, 11 months ago)

one of my baby cacti started turnin' black @ the tip after my kitty cat nipped the top off and eventually it shriveled up n i had to throw it away

but also i had to keep my cactuses indoors too cuz of the cold, the others are doin' fine tho and its started getting warmer n sunny out so i started leaving them outside during the day time and already i notice them growing a bunch!


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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14150928 - 03/19/11 09:45 PM (12 years, 11 months ago)

Probably sunburn due to coming out of dormancy. This is quite common and hard to prevent. You can lay a white cloth on the tip for several weeks gradually decreasing the time it is on there per day to acclimate the the new growth to the intense light.


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Re: San Pedro -- Black Spot @ the tip. [Re: naum]
    #14152011 - 03/20/11 01:49 AM (12 years, 11 months ago)



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|| Lophophora Growers Unite! || Trichocereus Growers Unite! || Stone Eaters - A Soil Revolution ||


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OfflineI AM SWIM
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Re: San Pedro -- Black Spot @ the tip. [Re: Mostly_Harmless]
    #14152605 - 03/20/11 07:23 AM (12 years, 11 months ago)



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Offlinefungivore
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14152651 - 03/20/11 07:48 AM (12 years, 11 months ago)

Quote:

I AM SWIM said:




yep, looks identical to the piece I cut off of mine


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OfflineI AM SWIM
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Re: San Pedro -- Black Spot @ the tip. [Re: fungivore]
    #14152704 - 03/20/11 08:12 AM (12 years, 11 months ago)

Quote:

fungivore said:
Quote:

I AM SWIM said:




yep, looks identical to the piece I cut off of mine




Did it start branching from where you cut the black spot off?

I plan on keeping this cacti alive for as long as possible, I want it to eventually flower like this



Would cutting cause a disruption from doin' its flowerin' thang?


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OfflineI AM SWIM
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14152721 - 03/20/11 08:21 AM (12 years, 11 months ago)

I'm thinking it may be sunburn, but I also think the black spot may have formed before putting it out in the sun. So I don't know if it got sun-shocked or not. It's hard to remember thangs of the past when bein' :feelshighman: 24/7

I've been using + ~ 10-15% perlite.

I'm not a fan of miracle gro, but I'm a noob to growin' thangs.
I know miracle gro isn't the greatest soil, especially for cannabis, but what do you think about it for cacti?


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Offlinefungivore
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14153102 - 03/20/11 10:42 AM (12 years, 11 months ago)

Quote:

I AM SWIM said:


Did it start branching from where you cut the black spot off?

I plan on keeping this cacti alive for as long as possible, I want it to eventually flower like this


Would cutting cause a disruption from doin' its flowerin' thang?




I don't know... I only cut it off three days ago. If it doesn't start turning black again, I'm guessing it will form another segment where I cut it. Not sure about flowering either; mine have never flowered.


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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14153124 - 03/20/11 10:50 AM (12 years, 11 months ago)

Location plays a huge role in determining whether or not the MG Palm, Citrus, Cactus soil is good.

Here it actually makes a decent base as it is mainly composted forest products, composted rice hulls, perlite, etc. with minimal peat. I still have to screen it to remove huge pieces of bark and add lots of other things. 50/50 screen soil and perlite seems to be a general recommendation and seems to work decently for many.

My mix is constantly evolving but something like this works well for me in containers in zone 9b with ~70-80" of rainfall per year:

35% 2xSifted MG PCC Soil [the in ground version]
10% Vermicast
5% Expanded Coir
15% Turface MVP ~1/4-1/8"
15% Perlite
10% Granite Grit ~1/4-1/8"
5% Granite Grift 1/8-1/16"
5% Crushed Limestone ~1/4-1/8"
Gypsum
Dash of Ironite

As you can see it is about 50/50 'organic'/'mineral'. So the 50/50 perlite/MG PCC is a good approximation. I use it as my base and adjust using depending on species. Bridgesii almost always get added pumice, expanded shale, or perlite.

Leafy plants that like neutral to slightly alkaline soil also get planted in the same mix with extra organic component.


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OfflineI AM SWIM
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Re: San Pedro -- Black Spot @ the tip. [Re: naum]
    #14153429 - 03/20/11 11:54 AM (12 years, 11 months ago)

Thanks for the info everyone.

I think I'm just gonna let it do its thang naturally, and not do thangs with it for now, I'll keep an eye on it in the mean time though.

:feelsgoodman:


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OfflineGGTBod
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14153914 - 03/20/11 01:36 PM (12 years, 11 months ago)

that pic is definitely die back no ifs or butts, sunburn causes blistering which then if servere enough the blisters collapse and lead to rott, this is die back

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Re: San Pedro -- Black Spot @ the tip. [Re: GGTBod]
    #14154850 - 03/20/11 04:54 PM (12 years, 11 months ago)

Alright, I just cut that part off, it's all fresh and green now.

I was hoping for it not to branch off, but I guess I'll see what happens next.

I have another one that I cut and used for certain purposes, and then it branched off and now the two cacti arms are in a weird position. They were growing up straight, but now one of the branches is leaning sideways.

one branch is pretty much vertical and the other one is horizontal making an almost perfect 90 degree angle.


I'm thinking of cutting both of the branches and then replanting them separately, (Like cannabis clones). The branches are small though, about 4-5 inches. Or maybe I'll try tying the one branch up, IDK yet, but it's been rapidly changing, just a few days ago they were sitting straight up. :shrug:


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OfflineGGTBod
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14154911 - 03/20/11 05:09 PM (12 years, 11 months ago)

Quote:

I AM SWIM said:
Alright, I just cut that part off, it's all fresh and green now.

I was hoping for it not to branch off, but I guess I'll see what happens next.

I have another one that I cut and used for certain purposes, and then it branched off and now the two cacti arms are in a weird position. They were growing up straight, but now one of the branches is leaning sideways.

one branch is pretty much vertical and the other one is horizontal making an almost perfect 90 degree angle.


I'm thinking of cutting both of the branches and then replanting them separately, (Like cannabis clones). The branches are small though, about 4-5 inches. Or maybe I'll try tying the one branch up, IDK yet, but it's been rapidly changing, just a few days ago they were sitting straight up. :shrug:





The bit you have cut off, let it dry and plant it and it might even root and then bud.

You're right angle trich sounds great apart from the wierd window space it would take up, you could easy cut the arms off and plant them, I have a 12 year old 4 inch high stump that i use just for this as i know the genetics are potent



here is a pic of it with two young pups, these two are going to go crazy this season.

It used to be a much taller stump but with each bud/cutting i have cut a part of the stump off to act as a root base direct on the food stock of the original stump to be completely buried, as you can see from the pic it is a wide "foodtube"

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OfflineI AM SWIM
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Re: San Pedro -- Black Spot @ the tip. [Re: GGTBod]
    #14154938 - 03/20/11 05:16 PM (12 years, 11 months ago)

Wow that's cool. Nice pic. Yeah I think I'm going to go the same route you went and just use it for growing arms and replanting them. the more the merrier.  :grin:


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OfflineGGTBod
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Re: San Pedro -- Black Spot @ the tip. [Re: I AM SWIM]
    #14154999 - 03/20/11 05:31 PM (12 years, 11 months ago)

Can you get a pic of it and load it up before you chop it? If the arms are long enough you could cut them into 15cm long pieces and make many cuttings, if you go much smaller than that they can take a long time to root, i read somewhere that you can cut into 2 inch chunks and they will eventually root but i have 2 pieces like this who have been in the soil for over a year now and they have not grown anything yet and i do not remove them from the soil to check incase i damage any fragile root developement

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