New....first off, Meyer lemons are a bit tempermental and you can have leaf drop with these guys. But, your tree needs a bit more heat,and just all around care.You should have a feeding schedule for your citrus.Citrus need to be fed.Find a citrus food,and follow the instructions on the box.Buy and use a moisture meter if you are having trouble watering.It's better to water when needed than to water unnessarily. And last of all, the tree needs more heat, 45 to 60 is a maintainable heat for citrus thru winter,even though it's getting good light. All these things are essental to growing citrus.There are plenty of citrus foods on the market if you don't happen to find any even Azelea food works.But in order to have a healthy and happy tree it needs a feeding schedule,heat,and water when needed, and light.When you water your citrus ,water it until the water runs out of the container throughly.This leeches out the salt residue.Also a handful of OSMACOTE fertilizer is good to dig around the top soil of your Meyer tree too, every 3 months.I use a brand of Citrus food made by "Whitney Farms" it's called Citrus & Avacado & Vine Food.Some of the Citrus dealers have citrus food available for sale.***Suzanne

Hi Suzanne,

I took your suggestion and fed the tree, and I can get a moisture meter. as for the higher heat--I'm pretty stuck. There is one warmer room, but very little sunlight there. all other sunny places are the prowling ground of my cats, who enjoy smacking and peeing in my plants, so that's out.
i thought browning ends was a vitamin/mineral thing rather than a light thing? but then again, if i knew more, i wouldn't be asking for help!

thanks,

cheryl

Cheryl,
For quick cheap way to warm your tree try wrapping the pot in Christmas lights. you might still be able to find some on sale.. I use a digital food thermometer to check soil temp. They will be in growth mode at temps above 70*F. Keeping the roots at an active growth temp the tree takes up water and nutrients more. If the temps low then the roots are not getting as much food and water to the leaves.. since it is in sunny spot it needs the bottom to be as active as the top..
I am new to citrus growing but this is what I have learned and so far my trees in south window fed once every other week with the pots heated have kept steady growth on them.
I think all of the healthy tree ingredients need to be present.. if the temp is lowered the light and food should be lowered.. I can't tell you what the proper ratio on light should be but my trees have south light and I have a grow light that comes on from 5 pm till about 9 pm.
hope this makes since.. I'm sure there are others that can better explain the concept and have better details.
Gina *BabyBlue*