New growth is yellow HELP

ok my babies are in the 4th week of flowering and the new leaves have yellow tips is this a problem or just normal...also can anyone tell me when its ok to use canna PK13/14?

lighting 250watt
day temp 24
night temp 20
water when they need it
nute- canna flores every 4 watering

flush your soil well and start feeding again

Tips burn when nutrients are starting to build up, without pics who knows what it could be.
you diagnose - http://www.marijuanapassion.com/forum/showthread.php?t=54277
Use PK13/14 to induce flowering- I start using 2 days before i change to 12/12, and
end it after 7 days under 12/12.Also use as a PK spike 4 1/2 to 5 weeks into flowering-
be careful not to use too much, easy to burn plants with PK. could be the cause of
your problem

omg the tips that are yellow have curled up what could that be
LKDBLM thanks for that link im keeping that just incase but its none of em

i get yellow tips sometimes just keep a eye on ur feed, pk13/14 is to be used 3 weeks before harvest so if u think they will take 10 weeks to finish then u want to add it around week seven, if they finish in 8 weeks then add in the 5th week, it says on the bottle in tiny wrighting to give it about 5 weeks into flower, heres a pic of my yellow tips !

thanks its my first time and i already lost 3 plants (males)
these are my yellow leaves


Also do the yellow leaves affect the buds?

Yellow tips on new growth usually means nute burn. In my experience anyway. Take it or leave it.

how often should i feed em roughly they are in canna soil(with nutes)

OMG all the bottom leaves are yellow and the rest are lime green really NEED HELP PPL

flush with 1/4 strenth mix thoroughly and leave till blocks or pots become light to lift and feed with transition ratio for one week, flush again and then feed bloom at 1250ppm. Foliar feed with humtea 1/2 recommended strength. I think this will help tremendously but as you know there are alot of factors. Make checklist of all factors you can think of. This is my first thread reply hope it helps

flushing has done nothing to it infact the bottom leaves that were yellow have fallen off and now the fanleaves that are lime green have red stems it still has 6weeks of flowering left could really use help

did you start feeding again at lower amounts?

you might be short on N, but 4 weeks before harvest you really shouldn't worry about that