6. Triangle your line flowers.
Place your tallest stem first, then a second to set your width, then a third slightly shorter one between them to form a triangle. Repeat this triangle pattern two or three more times through the middle and back of the arrangement so the whole design feels symmetrical without looking like a strict grid.
7. Place your mass flowers.
Add your mums first, since they're your biggest and most focal blooms, sinking a few down low so your eye travels into the arrangement instead of stopping on top. Triangle these the same way you did your line flowers, and repeat with your roses, keeping the roses a little taller and cutting a few down low to created depth.
8. Check for holes.
Turn your arrangement and look for any spots where you can see foam or greenery mechanics you don't want visible. This is much easier to fix now, before you add your delicate accent flowers.
9. Add a pop of brightness.
Place your bright orange spray roses as your filler flower, using them to fill remaining gaps and add a brighter accent against the moodier fall tones. Skip this step entirely if you want a deeper, moodier palette instead.
10. Finish with grouped bunny tail grass.
Group your bunny tail stems in odds (3 or 5 works well) and wrap the base with green floral tape so they act as one thick stem. Insert these groupings at varying heights throughout the design for a light, whimsical, snow-like effect.