I just had a tray of plants out for a little sun, for maybe 1.5 hours. When bringing them back in I noticed this browning...I don't think it just happened because I know there was a plant that had a little brown spot on a top leaf, that I thought touched the bulb in one of my lights. Does this look like some other problem or did I just sunscald these? There are actually 3 plants in the picture with brown leaves, most of them are on a Sunorange, but the other two are Sungolds.

Ouch. They should recover though.

I take it that means you think I sunburned them. I had taken them outside to spray some PureCrop1 on them after Pleepleus's thread where he praised a similar product, so I decided to leave them out for a bit. I guess too long, and in too direct light. If it's not something else I've done to them.

Looks like they need a little SPF 420 the next time they go out.

They should be just fine

Never exposed to the sun leaves will sunburn if left out too long, even in a couple hours the first day or two. One thing that an exacerbate sunburn is spraying foliage--the main reason if you are spraying you'll see instructions often recommend doing early in the morning or in the evening--and that is for established plants outside. I wonder if the combo of unhardened foliage+spraying resulted in very quick damage? But I also agree, the plants should recover and be fine, after a day or two you can decide if you want to snip the affect portions of leaves off.

The UV index jumped considerably, today. So, it might be that, but I'm not sure.

jmsieglaff wrote: ↑Fri Apr 22, 2022 2:48 pm Never exposed to the sun leaves will sunburn if left out too long, even in a couple hours the first day or two. One thing that an exacerbate sunburn is spraying foliage--the main reason if you are spraying you'll see instructions often recommend doing early in the morning or in the evening--and that is for established plants outside.

Yeah, the whole thing was dumb, I should know better, I just wasn't thinking.

30 minutes of sun, is what I've read is recommended for the first day of hardening off.

We both needed some sunscreen (me and the plants).

I keep mine in the bright shade to start them off. They will recover. The first two to three days in the bright shade and then an hour in full sun after that increasing the amount of sun daily.

cheesecloth a la godfather 1

Kinda looks like tomato russet mites to me, but everyone else thinks it's sunburn, so they are probably right.

Ginger2778 wrote: ↑Sun Apr 24, 2022 4:09 pm Kinda looks like tomato russet mites to me, but everyone else thinks it's sunburn, so they are probably right.

I've never seen sunburn look quite like that.

If you wet them and then let in the sun without being hardened off, yeah that is not surprising to see that. It happens, probably be few years and you forget and do it again.

When I first bring out thing I almost always cover them with some shade. Trusting to the cloud cover is dangerous, it almost seems spiteful at times. Wall to wall gray, move stuff outside, an hour later there is huge patches of blue sky. So for shade I put them either in a greenhouse that has the green tinted fiberglass reinforced covers, or 2 layers of agribon.

I thought I had about a dozen seedlings hardened off. We had a dry day in the low eighties and I left the plants in full sun and they looked fine later on. The next day was a couple degrees hotter. I figured I was good to go so I left them in full sun. At the end of the day one of the plants had some sunscald.

There were several varieties and in 3 different size pots. The smallest and largest pots were ok. One of the middle size pots had the sunburn. I noticed this pot was a little light and assume it needed some water. It did not show signs of wilting, just the sunburn.

I am wondering if adequate water helps reduce the chances of sunscald.

@zeuspaul, you made me think about karstopography's post in my brassica hardening-off thread: "Hardening off is perhaps trickier than it sounds."