Silversword Loop Via Halemau'u Trail is a 9.9 mile out and back trail located near Kula, HI that offers scenic views. The trail is rated as moderate and primarily used for hiking.
Haleakala National Park PO Box 369 Makawao HI 96768 For general park information, call (808) 572-4400. Recorded message is available 24-hours a day and will likely contain an answer to your question. To speak to a park representative, call the same number and press 0 during office hours of 8:00 am - 3:45 pm HST. Kipahulu (Coastal Area) For information specific to the Kipahulu area of the park, call the Kipahulu Visitor Center at (808) 248-7375 during office hours of 9am-5pm HST.
while there are many silverswords visible from the loop, i found the plants visible from sliding sands trail to be more appealing. definitely worth traversing this loop if you're already in the crater though.