Fan Leaves Turning Yellow, Is This Normal For Outdoor Grow, Cold Temps?

[sick&tired]

The fan leaves are turning yellow on my plants.  This started four days after switching over to bloom fetilizers.   With the cold temps is this normal or could I have a K issue?

[MrShpongle]

Uh, am I reading that you just switched over to bloom nutes 4 days ago?  If this is truly an outdoor grow, you should have changed from veg to flower a month ago as harvest is weeks away. 

 

As for the yellowing fan leaves, this is typical at this stage of growth.

[Chauncy Gardner]

Normal for leaves to turn yellow at this stage. You can remove all fan leaves now w/o ill effects.

[bax]

harvest is weeks away. 

How many weeks away would you say?

There have been some talks of frost in outlying areas.

 

Should I pull them before a frost?

The ladies are protected by some good trees and bushes from the wind.

 

Really bad weather, goes from 90s to 60mph wind to 40 at night.

 

It's my first time outdoors as well. Kinda nervous. Everything is still white pistils.

[Chauncy Gardner]

Apparently, cold temps and light frost are not too detrimental to some strains (Indica dominant?), so I would let them go until they look unable to take anymore. Also, new info from GW Pharma Lab study shows that plant potency isn't increased with increased flower time after 7 weeks, so you should be good to go if the plants can make it to mid October.

[sick&tired]

I have been giving them bloom fert for about four weeks now, the yellowing started four days after I started the bloom fert. I have put plastic up on the sides because we have had frost. I will take some pic's and post to see what you guys think. I have no clue, never seen a plant in any stage. I have had a couple of  friends look at them and they say they look good, in light of the fact I didn't start them until the second week of July. I have a couple of plants where the leaves are turning purple, supposed to be the same clone, but looking different in color.

Edited September 19, 2013 by sick&tired

[Celliach]

Purple color is probably caused by the cold.  

 

It's common for the larger sun leaves at the bottom of the plant to start dying off near the end of the plant's life cycle.  They're always the first to go.

[MightyMightyMezz]

I would not worry even if all the leaves get yellow by the end.  It will be smoother smoke that takes less time to cure. 

[Chauncy Gardner]

Look at the leaves on the buds to determine the health of the plant at this stage. If the buds look good, don't worry about the larger leaves. I have a plant that yellows and drops all its large leaves 6 to 7 weeks into flower., and then the buds turn purple. This is from an indoor grow so I wouldn't worry about this happening outdoors.