Wash and thoroughly dry all fresh vegetables herbs and edible flowers before beginning assembly.
Use a vegetable peeler or mandoline to create long wide flat ribbons along the length of each cucumber or summer squash — these strips line the inside of the wrapper and add structure and color.
Peel all root vegetables and cut turnips radishes and carrots into thin even matchstick strips using a mandoline or sharp knife — consistent sizing makes for neater rolls and more balanced bites.
Pick through edible flowers gently and select the most beautiful most intact individual flowers and petals — separate larger flowers like roses and nasturtiums into individual petals — keep small flowers like violets and wild mustard flowers whole — place in a small bowl of cool water to maintain freshness until ready to use.
Cook rice vermicelli noodles according to package directions — drain rinse in cold water and toss lightly with a small amount of sesame oil to prevent sticking — cool completely before assembling.
Set up an organized assembly station — arrange all prepared ingredients in separate bowls or piles within easy reach — have a wide shallow bowl of warm water for soaking rice paper a clean slightly damp surface or silicone cutting board for rolling and a parchment-lined serving plate for finished rolls.
Submerge one rice paper wrapper in warm water for exactly 5 seconds — count it out — remove immediately while it still feels slightly stiff and semi-rigid — do not over-soak.
Lay softened rice paper flat immediately on clean slightly damp work surface.
Before adding any other fillings place chosen edible flowers and leaves directly on the rice paper arranged face-down against the wrapper — this is the critical step that makes flowers visible from outside the finished roll — take time with this artistic arrangement step thinking about color balance and composition.
Place fresh mint leaves alongside and around the flowers to create a beautiful green frame.
On top of the flower and herb layer add a small modest portion of cooled rice vermicelli noodles.
Add thin cucumber or summer squash strips on top of noodles.
Layer matchstick carrots radishes and turnips over the cucumber strips.
Add asparagus sticks fresh spinach or tender green leaves and fresh cilantro.
Place sliced avocado on top if using — keep all filling portions light and modest — the beauty of these rolls is in their delicacy not in maximizing filling quantity.
Fold the bottom of the rice paper up and over the fillings tucking it snugly under the filling mound.
Fold both side edges in toward the center pressing gently.
Roll forward firmly and evenly toward the top edge applying consistent gentle pressure throughout — rice paper will seal itself.
Place finished roll immediately seam-side down on parchment-lined serving plate.
Repeat with remaining wrappers and fillings until all rolls are assembled.
Arrange finished rolls on serving platter with flowers and petals visible through translucent wrappers.
Serve immediately with chosen dipping sauces alongside.