SOIL Outdoor...Folding in leaves

[509sunkidz]

Strain: Great White Shark....The leaves curl in, and new leaves seem stunted and have a brownish tint, starts from the bottom and works up. noticed problem last month and have tried just about everything.... I use ph adjusted r/o water at 6.5, have used need oil, azamax, green cleaner, rosemary and clove oil and sns 203.to try and treat this issue. Made my holes out of fox farm happy frog, worm castings, bat guano and humic acid. Recently started feeding seaweed extract and nitrogen supplement at 7%. The plant has shade from intense heat and was fine until recently. My local growers are stumped and flowering season is coming...stressed for sure. Any information will be greatly appreciated. Thank you for your time.

 

[ellz]

It looks a lot like heat stress to me. You mentioned intense heat and that could be the problem. If it has been dry that will make the problem worse. As far as rememdies, there are much fewer than indoor grows, but they are:

Outdoors, you have less options to reduce heat during a heat wave, but you are able to monitor your local weather via weather forecasts.

It is possible to partially shield your plants when you know the temperature is going to get hot. You can also adjust your watering schedule to make sure plants at least have plenty of water.

Some things to try when you know the weather outside is going to be hot or dry:

• water plants in the evening or early morning to help prevent water evaporation during the hottest hours
• keep roots cool - for example by putting your potted plant in a ceramic pot to help insulate the roots from the sun. I've also heard of growers digging a hole in the ground to place their potted plant inside, because the ground is usually cooler than the air when the temperature gets high
• 
  kelp extract for roots - provide a small amount of liquid fertilizer that contains seaweed kelp extract (can help protect against heat stress)
• increase shade to reduce the heat experienced by plants - you can use an old sheet or other cloth as a short term solution, or get a profesionally made "Sun Shade Sail" which is made particularly to create shade outdoors. It's important to remember that giving plants shade for more than a few days will make them less "hardened" to the sun, and you may need to reintroduce full sunlight back slowly to prevent them from getting shocked from the light intensity
• move potted plants - luckily with potted plants, it's usually easier to move them out of direct sunlight during a heat wave
• take extra good care of heat-stressed plants - when cannabis plants appear heat-stressed, try to baby them as best you can, and offer shade during the hottest days.

When growing cannabis outdoors, it can often take a few weeks for plant to recover after a hot or dry spell, so prevention is the best medicine for outdoor plants.
http://www.growweedeasy.com/heat-light-stress