Great to know about smaller bulbs and vinca. Since our vinca is newly planted and not really doing anything at the moment, I am having a hard time envisioning how it will behave when mature, and I haven't yet witnessed its rampantness! This area is behind the house, so only visible to us and our closest neighbors, for the most part. It is closely visible if you are standing on the flat area between the slopes, but not so much from the patio or the back windows of the house. Perhaps I'll indulge my love of crocuses down along the retaining wall at patio level and go with larger plants on the slope. Other suggestions to pair with daffs? I like them, but I was hoping for more purples and oranges for this area. Anemone? Shorter tulips?

Vinca gets pretty thick, no dwarf bulbs will be suitable once it develops. And you can get daffodils with orange trumpets. But do you have slugs?

I have seen a slug here and there but nothing major. I already have a few daffodils planted by the previous owner and they never bothered them, nor have I noticed them eating my hostas or any of the other usual suspects.

If you want orange and purple, I'd include some tulips. But not short ones......taller growing types like the Darwin hybrids,

With taller tulips, I was worried that they might have issues remaining upright due to the steepness of the slope. I also thought they might look a little odd growing so tall above the vinca, especially in the first couple of seasons when it will be very low/sparse - unless I can find something mid-height to complement them? I love them in combination with muscari, but it sounds like they might be a little too small to compete with the vinca?

The slope will not affect them providing the bulbs are planted at the correct depth. And if you plant in fair sized groups they will not be particularly egregious growing above the Vinca. The do have foliage so they're not like drum sticks.

I would not do tulips (tend not to reliably perennialize - for me at least) and if you have any deer they like them more than many other things. I would second the daffs, and you can get a lot of variety among just daffodils. I also like wood hyanciths as reliable returners with colors that complement vinca (but some people think they are too reliable). I have them with vinca and they are tall enough above them, but not as tall as most daffs (and bloom later than daffs)

Thanks scgekg! I don't know if tulips will perennialize for me or not, so I would probably limit those to areas that are easy to reach (which much of my slope is not, unfortunately). I love the look of wood hyacinths and I will definitely add those to my list - no such thing as too reliable for me!

Cammasias, alliums and leucojum would be appropriate...with the former harmonising well with the vinca and having the vigour to compete.

Nothing to add to the great ideas here except it would be amazing if you planted in drifts or rivers. Like a patchwork of colors. You have the space and blank canvas - I'm so jealous!

Have you looked at the wholesale mail order nurseries? I mainly know Van Engelen although I have bought elsewhere.

Campanula, thank you for the camassia and leucojum suggestions - those are two I hadn't seen before and they are lovely! Posierosie - Van Engelen is the one I know too, and their prices can't be beat. Given how large an area I have, I will definitely be buying in bulk!

Love it! Then, are we going to be treated to some panoramic views this Spring? Hint hint??