Take a carrot and trim a little bit of surface off to make a five-sided pyramid. If you are not going to attach a stem, the base of the flower can come to a point; if you are going to attach a stem, the base of the flower has to be wide enough for a stem to be inserted.
Use the middle edge of a curved blade paring knife to carve the top arc of the petal from one top corner of the pyramid. At this point, when you carve one petal, don’t cut through the end. Keep 1.5 to 2 cm length connected to the point of the pyramid.
Use the point of the blade to mark arc shapes gently on the surface of the carrot . After that, the process should be easier. Once you have done five petals, use the edge of your turne knife to remove parts of the carrot that are still clinging to the root.
Use one hand to hold the main carrot, and your other hand to hold and twist the end of the flower. Remove the flower out from the main carrot.
Use point blade of a paring knife to carve a 0.8 to 1 cm circle hole from the bottom of the carrot flower.
Get a celery stalk and remove its top leaves and segment. Make a Julienne cut and keep it as long as you can.
Trim the top of the celery stick that you just cut to be a cylinder at its top section with a paring knife. The top diameter of the cylinder should match the diameter hole that you have created in the carrot flower.
Insert the celery stick into the hole at bottom of the carrot flower. The section inserted in the carrot bottom should be at least 2 cm long. As such, it will make the celery stick hold the carrot flower well.
Soak in salted cold water for 30 minutes to encourage the stem and flower petals to curve slightly, then arrange.