yes, yes you do.
put them in right after watering, and if you wanna go crazy--sterilize them beforehand with alcohol or similar. i've seen reed fencing & bamboo bring wierd fungal & moldy stuff... & if it's the painted wood, that green comes off over time.
some pvc pipe might be cheapest...cut 10' pcs in half at about 2$ a stick
apparently jamming in stakes in mid-bloom is very stressing to them, so i hear.