Seed Band Envelope Cushion: Free Knitting Pattern

There is something deeply satisfying about a cushion that looks far more complicated than it actually is. The Seed Band Envelope Cushion is exactly that kind of project — a beautifully textured pillow cover that combines the timeless simplicity of seed stitch with a clever envelope back closure, resulting in a finished piece that looks polished enough to sit on any sofa but is relaxed enough in construction that even an intermediate knitter can tackle it on a weekend afternoon.

This free knitting pattern walks you through every step of making your own Seed Band Envelope Cushion, from choosing your yarn to casting off the final stitch and stuffing the cover over a pillow insert. Whether you are looking for a new home décor project, a heartfelt handmade gift, or simply an excuse to break out a new set of needles, this pattern has you covered.

What Is the Seed Band Envelope Cushion?

The Seed Band Envelope Cushion gets its name from two of its key design elements. The first is the seed stitch band that runs across the front panel, adding a strip of elegant, tactile texture between two smooth stockinette sections. The second is the envelope-style back closure, where two overlapping panels fold like the flap of a letter, eliminating the need for buttons, zippers, or any additional hardware.

The result is a cushion cover with real visual interest on the front and a clean, seamless look from the back. It fits a standard 18-inch by 18-inch pillow insert, though this pattern includes guidance on how to adjust the sizing to accommodate different insert dimensions.

The combination of textures — smooth stockinette against the pebbly seed stitch band — gives the cushion a contemporary feel that works equally well in a minimalist Scandinavian interior, a cozy cottage living room, or a modern apartment. It photographs beautifully, which is a bonus if you share your makes on social media.

Materials You Will Need

Before you cast on, gather the following:

Yarn: Approximately 200 to 250 yards of a medium-weight (worsted or Aran weight, roughly 4 to 5 ply) yarn. A smooth, plied yarn will show the texture contrast between seed stitch and stockinette most clearly. This pattern works nicely in wool, cotton, or a wool-cotton blend. For a first attempt, choose a light or medium solid color so the stitch pattern reads clearly.

Needles: US 8 (5mm) straight or circular needles. If you prefer knitting flat on circular needles to avoid seaming later, a 32-inch circular works well.

Notions: Tapestry needle for weaving in ends and seaming, scissors, stitch markers (optional but helpful), tape measure or ruler, and an 18-inch by 18-inch pillow insert.

Gauge: 18 stitches and 24 rows over 4 inches in stockinette stitch, blocked. Gauge matters more for this project than you might expect for a cushion — being significantly off gauge will change the finished dimensions and may mean your cover does not fit your pillow insert properly. Take the time to knit a swatch, wash it the way you plan to wash the finished cushion, and measure it once dry.

A Quick Word on Seed Stitch

If you are new to seed stitch, here is what you need to know. In seed stitch, you alternate knit and purl stitches across each row, and then on every subsequent row you knit the purls and purl the knits. This is the opposite of ribbing, where you knit the knits and purl the purls. The effect is a beautifully bumpy, slightly raised fabric that lies flat without curling and has a satisfying density that wears well on home décor items.

Seed stitch is worked over an odd number of stitches for a straightforward setup: every row begins and ends with a knit stitch, and the pattern is simply K1, P1 repeated to the last stitch, then K1. Working over an even number of stitches requires you to keep track of where you are in the pattern slightly more carefully, but it is equally achievable. This pattern uses an odd stitch count for the seed band to keep things simple.

The trick to neat seed stitch is consistent tension. Because you are switching between knit and purl stitches every single stitch, there is more opportunity for the yarn to either tighten up or loosen between transitions. Moving the yarn to the front before a purl and to the back before a knit cleanly — rather than leaving it loose or wrapped awkwardly — makes a noticeable difference in the finished fabric.

Pattern Abbreviations

Throughout this pattern the following abbreviations are used:

CO — cast on
BO — bind off
K — knit
P — purl
RS — right side
WS — wrong side
St(s) — stitch(es)
Rep — repeat
PM — place marker
SM — slip marker
K2tog — knit two together (a right-leaning decrease)
M1 — make one (a left-leaning increase)

The Pattern

Front Panel

Cast on 83 stitches using your preferred method. A long-tail cast on works well here and creates a neat, slightly elastic edge that seams tidily.

Rows 1–22 (Stockinette Section One):
Row 1 (RS): Knit all stitches.
Row 2 (WS): Purl all stitches.
Repeat rows 1 and 2 until you have completed 22 rows total, ending with a WS row.

Rows 23–42 (Seed Stitch Band):
Row 23 (RS): K1, P1, K1; rep from to end.
Row 24 (WS): K1, P1, K1; rep from to end.

This is the key to seed stitch: every row looks the same when written out this way because you are always knitting the purls and purling the knits. If you find it easier, simply look at the stitch on your needle and do the opposite of what it appears to be.

Repeat rows 23 and 24 until you have completed 20 rows of seed stitch (rows 23 through 42 inclusive), ending with a WS row.

Rows 43–64 (Stockinette Section Two):
Row 43 (RS): Knit all stitches.
Row 44 (WS): Purl all stitches.
Repeat rows 43 and 44 until you have completed 22 rows, ending with a WS row.

You should now have a front panel measuring approximately 18 inches wide and 18 inches tall. Bind off all stitches loosely on a RS row. A loose bind off is important here — a tight edge can pucker when you seam the panels together and make the final cushion look pulled in at the corners.

Set the front panel aside.

Back Panel (Envelope Closure)

The envelope back is made up of two overlapping rectangular panels. The first panel (Bottom Flap) covers the lower two-thirds of the back, and the second panel (Top Flap) covers the upper two-thirds. When overlapped and placed against the front panel, they create a closed back with a generous overlap that keeps your pillow insert securely inside.

Bottom Flap:
Cast on 83 stitches.

Row 1 (RS): Knit all stitches.
Row 2 (WS): Purl all stitches.

Continue in stockinette stitch until the piece measures 12 inches from the cast-on edge, ending with a WS row.

Next row (RS): K1, P1, K1; rep from to end (seed stitch row).
Repeat this seed stitch row for 6 more rows (7 rows of seed stitch total) to create a neat, non-rolling edge that will sit at the overlap point.

Bind off all stitches in pattern on the following RS row. This means you knit the knit stitches and purl the purl stitches as you bind off, which keeps the seed stitch edge flat and tidy.

Top Flap:
Cast on 83 stitches.

Work 7 rows in seed stitch (same as the edge on the Bottom Flap) to create the hem at the bottom edge of the Top Flap.

Row 8 (WS): Purl all stitches (transitioning into stockinette).
Row 9 (RS): Knit all stitches.

Continue in stockinette stitch until the piece measures 12 inches from the cast-on edge, ending with a WS row.

Bind off all stitches loosely.

Blocking Your Pieces

Before seaming, block all three panels. Blocking is the process of wetting or steaming your knitting to even out the stitches and allow the fabric to relax to its intended dimensions.

For wool yarn, wet blocking works beautifully. Soak all three panels in cool water for about 20 minutes until they are thoroughly saturated. Gently squeeze out the excess water — do not wring — and lay the pieces flat on a clean towel. Roll the towel up with the knitting inside and press firmly to remove more moisture, then unroll and lay the pieces on a blocking mat or a fresh dry towel.

Pin each panel to its finished measurements (18 inches wide by 18 inches tall for the front panel, and 18 inches wide by 12 inches for each back flap). Allow everything to dry completely before seaming. This step is especially important for the front panel, because it ensures the seed stitch band sits squarely in the center and the stockinette sections on either side are even.

For cotton yarn, steam blocking or spray blocking tends to work better. Hold a steam iron a few inches above the fabric or spritz the panels with a spray bottle, pat gently to the correct dimensions, and allow to dry.

Seaming the Cushion Cover

Once all three pieces are blocked and dry, it is time to assemble the cushion.

Lay the front panel flat with the RS facing up. Lay the Bottom Flap on top with the RS facing down (so the two right sides are together), aligning the cast-on edge of the Bottom Flap with the bottom edge of the front panel. The seed stitch hem edge of the Bottom Flap should point toward the center of the cushion.

Next, lay the Top Flap on top of the Bottom Flap, again with the RS facing down, aligning the bound-off edge of the Top Flap with the top edge of the front panel. The seed stitch hem of the Top Flap points toward the center of the cushion, overlapping with the seed stitch hem of the Bottom Flap.

You should now have a sandwich of three layers, with the front panel on the bottom (RS up), and the two back flaps on top (RS down). The back flaps overlap each other in the middle.

Pin all four edges securely. Using your tapestry needle and a length of matching yarn, seam all four sides using mattress stitch or whip stitch. Mattress stitch creates an almost invisible seam on the right side and is worth the extra time. Work through all layers at once at the overlapping center section.

Weave in all ends securely and trim.

Turn the cover right side out through the envelope opening at the back. Give all four corners a gentle poke to make sure they are fully turned out, and press the seams lightly if needed.

Adjusting the Pattern for Different Pillow Sizes

If you want to make this cushion for a pillow insert other than 18 inches square, here is how to adjust.

For the width: Your gauge swatch tells you how many stitches equal one inch. Multiply the desired finished width by that number to get your cast-on count. Add or subtract stitches in pairs from the seed band section to keep the seed stitch pattern symmetrical, always aiming for an odd number of total stitches to maintain the simple every-row-the-same seed stitch setup.

For the height: Simply knit more or fewer rows in each stockinette section. If you want the seed band to remain centered, keep the band at 20 rows and divide any additional or reduced rows equally between the two stockinette sections.

For the back flaps, each flap should measure roughly two-thirds of the total cushion height to ensure a good overlap. A 16-inch cushion would need back flaps of about 11 inches, while a 20-inch cushion would need flaps of about 13 or 14 inches.

Yarn Substitution Ideas

The design of this cushion is flexible enough to work in a wide range of yarns, and swapping out the fiber or weight can dramatically change the finished look.

A chunky wool in a natural undyed tone gives the cushion a cozy, rustic quality that works beautifully in a cabin or farmhouse-style interior. Because you will need to recalculate your stitch count for a different gauge, it is worth doing this adjustment carefully, but the payoff is a quicker knit with a satisfying heft.

A linen or linen-blend yarn in a linen or dusty sage color gives the cushion a cool, airy, Mediterranean feel — perfect for a summer living room or a coastal-style space. Linen does not have the elasticity of wool, so your tension may feel slightly different at first, but the finished fabric has a beautiful crispness.

A tightly plied cotton in a bold solid color — think deep teal, burnt orange, or slate blue — makes the texture contrast between stockinette and seed stitch pop in a really satisfying way. Cotton is washable, which makes it practical for cushions that will see regular use.

Finishing Touches and Display

Once your cushion cover is assembled and your pillow insert is tucked inside through the envelope back, take a moment to fluff and position it. The seed stitch band should sit roughly in the middle third of the front panel, and the horizontal ridges of the seed stitch will be clearly visible as a band of texture crossing the face of the cushion.

If the cover feels slightly stiff when new, it will soften beautifully with use and washing. Most wool yarns bloom a little after the first wash, which can actually enhance the texture contrast even further.

For care, follow the yarn manufacturer’s guidelines on the label. Most woolen cushion covers benefit from a gentle hand wash in cool water with a little wool wash, followed by the same press-and-dry method used during blocking. This preserves the shape and keeps the stitches even over time.

Why This Pattern Works as a Gift

Handknitted home accessories make thoughtful, lasting gifts, and this cushion in particular is a wonderful one to give. It requires a moderate investment of time — most knitters will complete it over two or three focused evenings — but the result looks considered and professional in a way that a simpler garter stitch project might not.

If you are knitting it as a gift, think about the recipient’s home and choose your yarn accordingly. A gift for someone with a neutral, modern apartment might call for a natural oatmeal wool or a cool grey cotton. A gift for someone with a more maximalist, colorful space might shine in a deep jewel tone. The construction is the same regardless of the yarn, and the envelope back means the recipient can easily remove the cover for washing without any fiddly buttons or zippers to navigate.

A Few Tips Before You Cast On

Work a proper gauge swatch — washed and dried the same way you will treat the finished cushion — before you commit to the full project. A difference of just one stitch per inch across 83 stitches adds up to a noticeably different finished width.

Read through the entire pattern once before you begin, so that the overall structure is clear in your mind before you pick up your needles.

Keep your tension relaxed and consistent, especially in the seed stitch band. If you tend to knit tightly, going up half a needle size for that section can help the band match the drape of the stockinette sections on either side.

Trust the process of seaming. A well-seamed cushion cover looks as good as any you would buy, and the satisfaction of finishing and stuffing it is its own reward.

This Seed Band Envelope Cushion is the kind of pattern you will come back to again and again, in different yarns and colorways, as gifts and as additions to your own home. It is straightforward enough to be enjoyable and detailed enough to be interesting, and the finished result earns every compliment it receives.