Toxicity or deficiency? And of what?

gorillagrower0840

Well-Known Member
I am growing in canna coco and full line of canna coco nutes, a, b, rhizotonic, cannazym, boost, and pk 13 14. a few of the leaves have some small brown yellow spots on them. the tips of some of those leaves are also brown, curled up a little, and hard and crunchy. Overall, all my plants look healthy, but there's a few of those leaves with those problems. in the pic, it shows the spot in the middle of the leaf that is stained yellowish brown and also some tips that are brown and crunchy and curled. sorry if the color is off in the pic, but i don't have a good camera. i have been in flower for little over 5 weeks. these issues didn't start till after i started putting the pk 13 14 in the water, could it be phosphorus or potassium burn? i have been following canna's recommendations on how much nutes to use too. is it a toxicity or deficiency and of what?
 

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gg,
What you describe sounds like a nutrient burn. You can never really determine which nutrients is at fault. It's just a matter of excess ppm in feeding. But I don't see it in the picture.

When you added the Pand K, did you drop your base nutrients or add it on top of everything?

Are you watering with runoff at every watering?

Show us more pictures of these burnt leaves.

People usually flush a bit after a nutrient burn and slack off nutes for awhile and resume at a lower level. And always...take suggestions on the bottles with a grain of sand. They are almost always too high.
JD
 
gg,
What you describe sounds like a nutrient burn. You can never really determine which nutrients is at fault. It's just a matter of excess ppm in feeding. But I don't see it in the picture.

When you added the Pand K, did you drop your base nutrients or add it on top of everything?

Are you watering with runoff at every watering?

Show us more pictures of these burnt leaves.

People usually flush a bit after a nutrient burn and slack off nutes for awhile and resume at a lower level. And always...take suggestions on the bottles with a grain of sand. They are almost always too high.
JD
I just followed the feeding schedule provided by canna. I used the pk 13 14 along with the base nutes. I used every nute in the canna line as a matter of fact, like they say to. and yes I water till runoff every time I water them.
 
GG,
Of course they are going to recommend that...they are in the business of selling that stuff. I don't even want to know what all you are using...nor how much you paid for it. But YOU decide... how you are going to lower your PPM. A base bloom nute and PK 13/14 are what's most important for you at this stage. And since you didn't provide more pix...I guess it's safe to assume you burned them (from your description) So flush, wait a bit and resume lower levels so you don't burn them again. You'll have to figure out the details.
JD
 
Judging how dark and dry your fan leaves look i'd say you're burning them.

Looks nitrogen toxicity. Are any leaves curling like a talon claw?

How hot do you have it? Margin cupping is indicative of heat stress.
 
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