Polemonium (Polemonium Caeruleum Blue) - This perennial flower can be grown from Polemonium seeds and has the common name of Jacob's Ladder. The name was inspired by the leaves on the plant which are in successive pairs opposite each other resembling a ladder. It has attractive fern-like foliage that is arched and creates dense mounds from which blue flower spikes protrude upwards.
Polemonium (Polemonium Caeruleum White) - This perennial is a cottage garden favorite grown from Polemonium seeds. It is also known as white Jacob's Ladder, and it is a hardy herb that was used for medicinal purposes for centuries.