how far is the light from the plant ...

i am not sure 60 watts is sufficient ... did you research that???

nor the 10 hours .... i used to do 4 florescent at 16 to 24 hours.. 2 inches from the plant .... as you can tell.. that was a bit more light.. than i suspect you give yours ..

is it an old leave.. or a new leaf??

how close to the window.. and how freakin cold has it gotten in PA in the few weeks since you noticed this happening ...

my windows have been icing over off and on for the last month in MI ... mostly because my furnace kicks down to 64 degrees at night ...

those are not parsley growing temps ...

ken

ps: odds of virus.. on a single plant.. isolated in a single house.. are astronomical.. IMHO ...

Well....the leaves are pretty new...just planted the thing about 2 months ago. The cold is an interesting idea....it's freaking freezing outside...overall we keep things warm in the house though. Are you thinking that this is a nutrition thing and nothing like some kind a disease?

I think I'll try adding another light. I welcome any other thoughts.

Are you thinking that this is a nutrition thing and nothing like some kind a disease?

==>>> lack of light. IS A NUTRITION thing.. in that the plant can not photosynthesize enough for the plant to thrive ... BUT YOU CAN NOT OVERCOME LACK OF LIGHT THRU FERT ... ever ...

did you look into your plant.. and find out where the brand new growth comes from.. perhaps the center.. and whether this is fresh from the center.. or out at the edge.. the ones at the edge are older??? such varies according to the plant.. YOU HAVE TO LOOK ..

and though you claim your house is warm ... is it consistent all night long.. or do you kick back the heat??? .. why dont you get up around 3am.. and put your hand near the window and plant.. find out just how chilly it is ...

IMHO ... its light and heat.. said it twice now.... and your reply is.. should i fert it ...

never fert a stressed plant... find out whats stressing it ...

good luck with the second light.. how close will that one be????

disease is a long shot.. in a single plant.. in a given house ... i just dont buy it.. on the facts provided ... BTW.. did you use new media.. or old used potting soil .. or even worse.. dirt??? ... either of those could bring in disease ... if not properly sterilized ... prior to use ....

perhaps a pic of the whole might help????

its hard to grow food plants indoors ... and keep in mind.. by the time you start running two lights ... plus the cost of both lights .. you are going to be spending a lot more money.. than it would cost.. to just go buy the cilantro.. at the store .... its fun to try these things.. but keep the cost/benefit ratio.. clearly in mind .... that is one of the reasons.. i gave up doing this .. long ago ....

as to houseplants.. i have very few.. and only those.. that after years of abuse.. thrive in the native conditions of my house ... no matter how dark winter is.. and no matter how cold i set the furnace at night.. and ones that can cope with whatever light comes thru the winter window .... and you can read that to understand.. i killed a lot of them.. lol ...

think about when a plant.. comes to maturity outside.. your vegetables ... and herbs... mature.. in the warm soils of mid to late summer, when the sun is at its apex ... and let me suggest.. that your house in winter.. is not equivalent [i even forgot about humidity as a variable.. if you have a forced furnace, that can be all screwed up as the furnace burns all the moisture out of the air] ... and on that logic.. that is why your plant is not THRIVING ... but simply coping ... and also.. under this logic.. i dont need to jump to disease .... as there is just so much variance to it growing in mother nature ...

you are on a grand learning curve here.. dont give up hope.. or trying.. even if you get so frustrated.. you just whip the plant out the back door in the dead of winter.. lol.. been there done that.. started over... lol ...

ken

ps: even if it is disease... how do you treat a food plant???.. in the house.. in winter??? that is when it goes flying out the back door ... lol ... and treatment.. would be another 10 bucks min. invested .... at some point.. its just not worth it ...

I'm growing cilantro indoors for the first time. Mine started to show some red edges around the leaves. It seemed to getting too much light. I moved one pot of cilantro to the far corner of the grow light area, so that it was not directly under the light (very strong LED light). I moved the other pot of cilantro to a windowsill and shined a much smaller grow light at it about 2 feet away. Now neither have red spots. Both are very happy.