Curled, Brown Leaf Tips - Cannabis Cultivation

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13eetleJuice
The ghost with the most

Registered: 04/20/08
Posts: 368
Loc: 6' under fertalizing bud

Curled, Brown Leaf Tips

#412424 - 05/05/10 10:59 AM (15 years, 23 days ago)

Soil Growers:
1. Are you growing from seed or clones?
-- bag seed

2. How old are your plants?
-- approximately 18 weeks (131 days). 80 days veg / 51 days flower.

3. How tall are your plants?
-- Non-LST'd plant: 2.5ft. from soil to tip.
-- LST'd plant: 1.5ft. from soil to the plant's natural apical tip.

4. What size containers are they planted in?
-- 1 gallon

5. What is your soil mix?
-- 50% aged potting soil (likely 6 years old)
-- 30% perlite
-- 20% vermiculite

6. How often do you water and what type of water do you use?
-- I water every second or third day with well water from the tap, amended with Schultz 10-15-10 Plant Food Plus liquid fertilizer, following the instructions on the bottle of 7 drops per quart of water every watering.

7. What is the pH of your water?
-- 6.0-6.2 from the tap
-- 7.2-7.4 with Schultz added (which I've been adjusting with pH DOWN to 6.4-6.5 prior to watering.)

8. What kind of fertilizer do you use and what is its NPK ratio?
-- Schultz 10-15-10 Plant Food Plus

9. Do you foliar feed or spray your plants with anything?
-- I foliar fed with tap water during veg occasionally but, not during flower.

10. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")
-- ~250w combined (5x23w CFL, 4x26w CFL, 2x13w CFL, all 2,700k plus 1x17w 7,800k Fluorescent Tube)

11. How close are your lights to the plants?
-- 4" to 6"

12. What size is your grow space in square feet?
-- 8.75ft.² total grow room space
-- 3.75ft.² actual square footage of space filled by plant foliage

13. What is the temperature and humidity in your grow space?
-- Temperature: Usually 86 degrees Fahrenheit
-- Humidity: I don't know yet. I'll recalibrate my hygrometer and update this post.

14. What is the pH of the soil?
-- I don't have a soil pH tester. It is the next item on my shopping list.

15. Have you noticed any insect activity in your grow space?
-- The house fly that I killed yesterday is the only insect I've seen in my grow space.

16. How much experience do you have growing?
-- This is my first grow.

Many of the older, larger fan leaves have begun to yellow and fall off.

I've had a minor problem with curled, burnt leaf tips throughout the grow but now it's starting to get worse and is showing up prominently on new growth, something that hasn't happened before. Previously I had attributed this to heat stress as it is generally 86 degrees inside the cabinet when the lights are on. Sometimes it creeps up to 90 and on a rare couple of days it's gotten as high as 95 but that was a few weeks ago.

Here's a couple of pictures to illustrate the problem:

Here's the link to the full Grow Log

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