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Questions senescence? Burnt tips?

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Topic starter

Hello everyone I was wondering about two things.

Is one of my girls entering or in senescence?(Blue gelato 41-barneysfarm)

Does my other girl have nute burn?(Chemical Bride-greenhouseseedco)






2 Answers

First one has little nitrogen deficiency and leaves turning purple.

Second one has little nitrogen burn in leaf tips but pale color because of pk deficiency. Or if nutes should be spot on then its ph/watering that causes nutelocks etc.

Poshpheno Topic starter November 12, 2022 1:00 pm

@juglans they are in autopots and the ph does change over time in the reservoir I do check my ph and calibrate my equipment regularly

im_sparky im_sparky November 12, 2022 1:22 pm

@juglans good thing. What pH is the res at?


It is hard to give any specifics without a lot more information (growth medium, feed, watering rate, when appeared, where appeared first(top/middle/bottom, and where on the leaf it appeared (tip, petiole, edge, etc). Keep in mind that there are several issues that look similar so in the absence of more info is difficult to say with any certainty.

However, to attempt to help you out, here are my 2-cents worth: the first plant looks to my like it may be mag deficient with the interveinal chlorosis. You can test this by make a solution of 1teaspoon of epsom salts/liter or quart of water, spray just before lights out. If it is mag, you will notice an improvement over night, and many plants bounce back completely in 24-36 hours. However, it could also be senescence, but I don't think so. Also buds bulk-up quite a lot in the last 2 weeks so you probably want to find if this a mag issue or not; mag helps plants metabolize several nutrients.

The second plant does look like its likely had a little nutrient burn. Sometime this can be called a "nursery burn" where the nursery loads up the plants a little high in nutrients so when they ship to a retailer, the retailer does not need to feed for a long while, just water them. However, a wind burn can be the cause of it too, since too much evaporation from the leaves from a fan can result in excessive nutrient build-up in the tips and edges of the leave. This is caused but the the plant not being able to bring up water fast enough to the leaves to account for the moisture loss in evaporation  Also. lack of watering, followed by too heavy of a feeding can cause a similar burn without technically being an excess.

Hopefully that is helpful and I did not muddy the water. If it were me, I would test for Mag on plant one, and  back off the EC on feed for plant two and see how they respond.


To see a World in a Grain of Sand, And a Heaven in a Wild Flower,
Hold Infinity in the palm of your hand, And Eternity in an hour.
― William Blake

Poshpheno Topic starter November 12, 2022 12:58 pm

@im_sparky ok I’ll check it out the thing is they are in the autopot system so the feed as they plz I think maybe next feed should just be water maybe with some calmag or just mag ?

im_sparky im_sparky November 12, 2022 1:20 pm

Mag is a highly mobile nutrient that can be easily absorbed through the leaves (and more quickly). Spray them with the solution as above and it will let you know if it is a Mag deficiency overnight.

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