Hostas grow best in soil that remains evenly moist. Usually if the leaves are turning brown this indicates some type of moisture problem. You can increase watering so the plant receives at least 1 inch of water weekly, and cover the soil with a 2-inch mulch layer to help conserve moisture.
I agree with previous poster. I don't know what type of soil you have but I always start with soil and amend it.
If soil is heavy (clay type) make sure you break it up good and amend with organic matter, maybe add some peat and other nutrients. Then add top layers as suggested. If you have sand(like I do)you bring in topsoil and amend if also. Brown color could also suggest heat issues too. Do you have underground sprinkling? Sometimes plants get burnt when watered at the wrong times too. Of course plants can get too much water as well.
Hostas are very drought tolerant, but strong sunlight intolerant. The heat may be affecting it, but if you are watering them too frequently that could be the problem. I water my hostas that are not mature just because they don't shade the ground yet, the mature ones, maybe two to three times a season when there hasn't been rain for a couple of weeks. I have cared for hostas since the 70's and never seen them turn brown no matter how dry or wet(Mom had hundreds on the edge of the woods on her property) and I have probably 50 or 60(lost track) mature or new hostas.
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Hostas grow best in soil that remains evenly moist. Usually if the leaves are turning brown this indicates some type of moisture problem. You can increase watering so the plant receives at least 1 inch of water weekly, and cover the soil with a 2-inch mulch layer to help conserve moisture.
I agree with previous poster. I don't know what type of soil you have but I always start with soil and amend it.
If soil is heavy (clay type) make sure you break it up good and amend with organic matter, maybe add some peat and other nutrients. Then add top layers as suggested. If you have sand(like I do)you bring in topsoil and amend if also. Brown color could also suggest heat issues too. Do you have underground sprinkling? Sometimes plants get burnt when watered at the wrong times too. Of course plants can get too much water as well.
Good luck!
Hostas are very drought tolerant, but strong sunlight intolerant. The heat may be affecting it, but if you are watering them too frequently that could be the problem. I water my hostas that are not mature just because they don't shade the ground yet, the mature ones, maybe two to three times a season when there hasn't been rain for a couple of weeks. I have cared for hostas since the 70's and never seen them turn brown no matter how dry or wet(Mom had hundreds on the edge of the woods on her property) and I have probably 50 or 60(lost track) mature or new hostas.
http://homeguides.sfgate.com/sunburned-hostas-99649.html
http://homeguides.sfgate.com/hosta-care-after-browning-outside-edges-leaves-96667.html