All of the H. paniculata start lime, turn white, and end with some shade of pink ranging from a reddish pink to a lightly pink buff color. How long the various selections spend in each part of the color phase varies. I think some of the pink shades could look fine with brick. There are several folks who grow Bobo who regularly post on the perennials forum, so you could ask there if they have photos and when they take on the pinkish tinge so you can judge if they would work for you. Here is a thread with a pink phase photo. Do you need a plant that small or would 4'-5' work? There are some varieties of H. paniculata in that size range that spend less time in the more pink shades, such as 'White Diamond', which from what I read spends more time in the white phase than most others (I own one, but it's new this season.) Check out Little Lime and Little Lamb as well in the 4'-5' range. If nothing else works, you can get a variety that stays white longer and then cut off the hydrangea blossoms when they get too pink. This is a really long blooming shrub, so even if you prune off the pink phase, the pale green and white time period of bloom will add up to several weeks. If you add where you are, we will have an easier time judging whether colors and blooms times will be similar in your garden to other posters' experience. Here's how to add it to your profile so it posts automatically next to your name: Go to Your Houzz in upper right of every page, click Edit Profile, and on the left side click advanced settings. Well down the advanced settings page is a blank labeled Climate Zone for Garden Forums along with a link to find your zone. If you add info on your state or the nearest large city you will get even better information since zone only relates to average coldest winter temperatures. Then return to the top of the page and click Done Editing.

I honestly don’t know how best to do that, though whatever you use should have similar texture to the soil there. If mounded too much you may find that soil washes out onto the sidewalk. If you decide to build it up in some way, be sure to lift the Bobos as well. Don’t mix whatever you use into the soil as soil texture changes can lead to issues with the way water moves through the soil, either puddling around the base of planting holes or staying perched where texture changes.

Oh good! I'm beginning to worry about mine. I planted a few three years ago, , two died of a weird fungus. I moved the third to a different location but it didn't bloom that year. This year it looks great but no buds yet that I can see. Zone 6b.

EDIT: I TOTALLY MISSED THAT YOU'D SPECIFIED ZONE 4 - MY APOLOGIES, there are a few Zone 5's I suggested. You don't mention light requirements but here are some evergreen shrubs to consider: ZONE 5-9 Wee Willie Boxwood - 2' x 2' ZONE 3-7 Anna's Magic Ball Arborvitae - 10" - 15" tall and wide ZONE 3- 7 Tater Tot Arborvitae - 12" - 24" tall and wide ZONE 5 - 8 Fire Chief Arborvitae 2" tall and wide in 10 years; 4' tall and wide at maturity ZONE 3 - 6 Dwarf Norway Spruce - 4' wide and 18 - 24" tall after 10 years ZONES 2-7 Carstens Wintergold Mugo Pine 1 - 2' tall and slightly wider after 10 years NOT AN EVERGREEN BUT GOOD WINTER INTEREST ZONE 2-8 Kelsey's Dwarf Red-Osier Dogwood 24 - 30" tall and wide Here it is in summer . . . And in the winter