Go to the Vertex Subobject mode (shortcut: "1") and press Ctrl+A to select all vertices. Then Chamfer them with an amount of about 1.8.
Switch to Edge Subobject mode (shortcut: "2"), select all edges (Ctrl+A) and extrude them with an Extrusion Height of 2.5 and an Extrusion Base Width of 0.3.
Back to the flower's stalk. In Edge subobject mode, enable Ignore Backfacing and then select and move around the edges and vertices of our shape on X and Y axis aiming for a realistic "noisy" geometry. After that apply a MeshSmooth modifier.
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