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OfflineTheFourthEyE
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Yello growth on cactus?
    #18826759 - 09/11/13 07:42 AM (10 years, 4 months ago)

Hey guys, i saw some yelloness on the tip of my san pedro


The rest of the cactus is still looking OK.


I don't know if it has to do with this little guy


Any thoughts?


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InvisibleK1ngSp4de
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Re: Yello growth on cactus? [Re: TheFourthEyE]
    #18826801 - 09/11/13 08:01 AM (10 years, 4 months ago)

Looks like a nutrient problem to me, but I'm not too experienced.


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Offlineintelligentlife
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Re: Yello growth on cactus? [Re: K1ngSp4de]
    #18827050 - 09/11/13 09:24 AM (10 years, 4 months ago)

I have seen similar problems with trichocereus cuttings buy'd from nurseries... Their growth tip are sometimes similar but planting them to my soil mix and so on, they will disappear.

I am not sure but it can be very minor sun burn or lack of nutrient(s)

If you don't have fertilized your cactus for a while, give it a small amount of fertilizers with next watering.. I have noticed with trichos that they will like more nitrogen than any other cactus does.

I don't know the certain nutrient what it can be or is it even problem of nutrients.. Try small dose of fertilizing the cactus if you don't have fertilized it for a while.. If you have, try to move it more shady place cause it can be very minor sun burn what leaves only scar to the cactus.

Or you can try both, when it's time to give drink, give fertilizers and keep it in shade for week or so so you can see what happens on the top of cactus.

Just don't rush and do anything dramatic, first of all I would start by trying to give it smaller amount of sun.. Fertilizing issues usually (in my cactus garden) causes them to grow poor and slow... However when I have obtained cuttings they has got similar growth tips possible cause of sun burned them after long time kept in shade and fast move to sunny spot.

Try few things and see week or two what happens.. Fear of over fertilizing is not so dramatic cause your trichocereus is to big and they can tolerate quite big amount of fertilizers.. I have tested trichocereus given as much nitrogen as I have usually given to cannabis plants. They have just liked it but constantly fertilizing causes problems..

I am not still quite sure about fertilizing problem, looks like it has "baked" from top.. I have seen burned tricho tips cause of strong artificial lights and they are at first days very similar and later on develop scarring. If this doesn't go away with moving cactus to shade, then I would try to give fertilizers if I feel really necessary.

Are you from south or north? Do you have starting your growing season or ending it? If you are starting the growing season, sun burn it is what is very common at spring time. Some times scarring is bad, sometimes it's very minor and cactus growth tip will used to it but left some scars there.


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Edited by intelligentlife (09/11/13 09:28 AM)


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OfflineTheFourthEyE
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Re: Yello growth on cactus? [Re: intelligentlife]
    #18827494 - 09/11/13 12:07 PM (10 years, 4 months ago)

Intelligentlife, thanks for the response. However
I though it may be lack of nutrients, but im hesitant of fertilizing it as the last time i fertilized it, it became very swolen up and bloted?

I DID add some bonemeal, hoping that would help. Do you know what are good sources for just nitrogen?

I live in the south and spring has started yes.
Do you think it may be over watering?


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Offlineintelligentlife
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Re: Yello growth on cactus? [Re: TheFourthEyE]
    #18827528 - 09/11/13 12:16 PM (10 years, 4 months ago)

I believe it's cause of spring, little bit shock from sun.. I have commonly seen this with cacti at spring cause of dormant cacti get accidentally sudden strong sun.. It can be left to be minor burn or not.. Even you move plant to shade, what I suggest for real, it can see damage goes worse but in few days you will see new growth... Later on just let it used to sun little by little.

Do you say these spots are starting to feel soft and so later coloring turns to black?

..if so spring sun has burned it a bit.. Keep it less in sun and let cactus used to sun by giving more and more every week or so.

If they will swollen and plump up from the spots where they are at yellow in picture, it's cause of sun.

At spring time, this happened to me almost every time with few cactus, they got plumped spots and later white scars when they overgrow the section over the season.

I have used nitrogen fertilizers from regular shops or nurseries.. I use fertilized what purpose is to feed blooming plant, N is more less in ratio to P and K.


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Edited by intelligentlife (09/11/13 12:19 PM)


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Offline420milehigh
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Re: Yello growth on cactus? [Re: intelligentlife]
    #18828694 - 09/11/13 04:47 PM (10 years, 4 months ago)

I use jamaican bat guano since it has like a 2-5-1 NPK... if you just want nitrogen then water with some old coffee or stale beer


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OfflineMaito
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Re: Yello growth on cactus? [Re: TheFourthEyE]
    #18829531 - 09/11/13 07:40 PM (10 years, 4 months ago)

Quote:

TheFourthEyE said:
Intelligentlife, thanks for the response. However
I though it may be lack of nutrients, but im hesitant of fertilizing it as the last time i fertilized it, it became very swolen up and bloted?

I DID add some bonemeal, hoping that would help. Do you know what are good sources for just nitrogen?

I live in the south and spring has started yes.
Do you think it may be over watering?




Don't worry about it swelling and boating, that is just how it stores excess water. Some splitting may occur, but that usually just happens to the slow growers.


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Offlineintelligentlife
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Re: Yello growth on cactus? [Re: Maito]
    #18830852 - 09/12/13 12:36 AM (10 years, 4 months ago)

And.. I meant with swollen and plumping, I talk about black spots usually appears to top of tirchocerus after cactus has spent winter without no proper sun... When it's starting to get sun, even in same place at nature the top of the cactus can get blackish ooze areas to the top of the cactus, first they are just yellowish plump spots, then blackish and later they re gone.


That's a common thing what has happened to some of my cacti when they are getting the spring sun suddenly so much after changing the environment light levels from low to bright.

I would not talk about fertilizers causing this ornamental problem, I think cactus is has got strong spring sun suddenly without letting the cactus used the spring sun so tip has burned a bit.

But cause of season starting at south anyway, there is no harm done to use fertilizers too... But the yellow spots below the skin in my mind are caused by suddenly strong spring sun, depends how long top of the cactus has been exposed to strong light, it can turn these yellow areas to black ooze spots what will be gone when season goes forwards to summer and fall..


Almost every spring some cacti take growth tip damage, depends where they has been kept dormant and how sudden the environment change has been.

..If cactus is kept indoors (like basement) over winter, then at spring cactus has moved to outdoors, it will get some top damage from sudden light change.

This can even happen to cactus what has been in parcel in mail week or two, after taking it out when moving it directly to strong light from dark box, specially trichocereus have this issue and sudden increased light amount will cause growth tip to generate yellow "dead skin" to top or later they develop to black ooze under the skin what will fade away when cactus used to spring and summer sun.. These are all afaik harmless but caused by dramatic changes with light intensity.

Worrying about skin of trichocereus like in the pics of the growth tip if asking from me is just overwhelming worry about the cactus and it's health.. Like I have said I have seen strong light bulbs cause similar effects with blazing heat to growth tip of trichocereus. With this species, symptoms like this and sun caused growth tip damage with cactus generates lots of black ooze area are very common especially when spring comes and light intensity will get stronger.

If this cactus turns these yellowish areas to black ooze swollen spots, it's caused by sun and there is nothing you can do it than let them be and form scar to it, when time goes the black ooze under the skin will disappear as fast as they has come. They can be cut away with knife if want but I don't do that cause they will fade away on their own.


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Offlinethud thud
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Re: Yello growth on cactus? [Re: TheFourthEyE]
    #18831275 - 09/12/13 06:14 AM (10 years, 4 months ago)

Quote:

TheFourthEyE said:
I don't know if it has to do with this little guy






The exact same thing happened to my san pedro. not a nutrient problem; that will turn start turning green in no time

The spots on the first picture look like whats happening to an unrooted bridgesii cutting of mine. Makes sense because I just potted it outside a week or two ago and spring has arrived


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