Most likely it is because your daylilies have too little or too much water. If you are concerned by the soil, have it tested and ask the expert what amendments you need for your daylilies. Most daylilies are very hardy.
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Lemon lily is an old plant that was actually used in the hybridization of modern daylilies. It bloom earlier than daylilies and has a citrus scent. It is a vivid yellow color.
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The juxtaposition between the yellow daylilies and the purple salvia was striking.
photosyntosis
Most likely it's the end of the peas' growing season in which they will turn yellow and die off.
Lily leaves turn yellow due to a lack of nutrients, such as nitrogen, or excessive watering, which can lead to root rot. This causes the leaves to lose their green color and turn yellow.
Zucchinis turn yellow after picking due to the natural ripening process, which causes the chlorophyll in the vegetable to break down and reveal the yellow pigments underneath.
Rabbits and deer eat daylilies. Even cats will chew on daylilies.
Some varieties of tomato have yellow fruits and therefore this is perfectly normal.
There are daylilies in most temperate locations.
After daylilies bloom, you should deadhead the spent flowers by cutting them off to encourage more blooms. Remove any yellow or withered leaves and water the plants regularly, making sure the soil is well-drained. Fertilize the daylilies in the spring and divide them every few years to prevent overcrowding.