We might suggest dividing the lilies, but if you lifted and looked at some and they don’t appear to need that… Then, we were beginning to think that maybe your altitude put you on the extreme end of the hardiness zone. But you’ve had success in the past. How about the soil pH? If you have lilies that prefer neutral to alkaline soil, the pine needles—esp if you have mulched with them over a period of years—may have altered the soil pH. Check it and amend, as needed. Fall is the best time to lime. Here in info on pH: /content/preparing-soil-planting And more on soil amendments: /news/gardening/gardening-advice/organic-soil-amendments-explained
We suggest high-potassium fertilizer above; ever done that? It would be lacking.
As for planting deeper; per above (you should review all the tips above), the holes should be 2 to 3 times the bulb’s diameter. If you think that’s it, we suggest checking the pH, amending as/if necessary, and then planting in fall.
We might suggest dividing the lilies, but if you lifted and looked at some and they don’t appear to need that… Then, we were beginning to think that maybe your altitude put you on the extreme end of the hardiness zone. But you’ve had success in the past. How about the soil pH? If you have lilies that prefer neutral to alkaline soil, the pine needles—esp if you have mulched with them over a period of years—may have altered the soil pH. Check it and amend, as needed. Fall is the best time to lime. Here in info on pH: /content/preparing-soil-planting And more on soil amendments: /news/gardening/gardening-advice/organic-soil-amendments-explained
We suggest high-potassium fertilizer above; ever done that? It would be lacking.
As for planting deeper; per above (you should review all the tips above), the holes should be 2 to 3 times the bulb’s diameter. If you think that’s it, we suggest checking the pH, amending as/if necessary, and then planting in fall.
Hope this helps!