must-have ! (6) White Oleander 5 in. to 7 in. Cuttings For Soil or Water Propagation!

" Growing well with only one yearly fertilization and springtime pruning, oleander is one of the easiest shrubs to care for. So The plant can be trained into a short central leader in the nursery and is often sold as a "standard" oleander. It grows into a round-headed ball, flowering year-round in USDA hardiness zones 9b through 11. Flowering is reduced in winter in USDA hardiness zone 9a. Note that complete parts of the plant are poisonous.
Oleander survives drought well and is well-suited to growing on soil too poor for exceptionally other shrubs, even tolerating salt spray, brackish water, and alkaline soil. It thrives in full sun, appearing too lanky and flowering little if planted in partial shade. It is commonly planted in highway medians as a no-maintenance plant. It grows following wet weather, slowing down in drought, but always looks good even in powder-dry soil. "

The above from The University of Florida.
These propagate well in water.