About Alternanthera

‘Purple Prince’ is a stunning foliage plant grown for its vibrant burgundy-purple leaves. Compact and fast-growing, it’s perfect for containers, garden borders, or mass plantings. It is ideal for warm climates or summer annual use.

When to Plant Alternanthera Seeds

If starting indoors, sow your alternanthera seeds six to eight weeks before your last expected frost date.

If directly sowing, wait until after all danger of frost has passed and nighttime temps are consistently above 50°F. Foliage may be damaged if exposed to temperatures below 45°F.

Where to Plant Alternanthera Seeds

Choose a location in full sun. Alternanthera can tolerate a partially shaded location but will provide a richer foliage color the more sun it receives. Make sure the soil is well-draining and that it is enriched with compost or organic matter.

Expect plant height to reach 10 to 16 inches tall to plan the optimal location in your garden.

How to Plant Alternanthera Seeds

When starting indoors, use seed trays or small pots with drainage holes and fill with moistened, sterile, well-draining seed-starting mix. 

Press the seeds gently onto the surface of the soil for good seed-to-soil contact. Do not bury the seeds, they need light to germinate. Learn more about germination light requirements here.

Keep soil evenly moist but not soggy.  At first it may be helpful to use a spray bottle and mist to avoid displacing seeds. Provide bright light (grow lights or a sunny windowsill) and maintain soil temps between 72°F and 76°F. Cover with a humidity dome or plastic to maintain high humidity and your seeds should typically sprout within three to four days.  

Whether seeds are directly sown or started indoors, final spacing should be 12 to 14 inches apart. 

How to Care for Alternanthera

Alternanthera thrives in temps between 65°F and 75°F. Continue to keep soil slightly moist, allowing the top to dry slightly between waterings. Once seedlings are established, begin feeding with a diluted balanced fertilizer every one or two weeks.

Pinching and pruning is not necessary, but can encourage a more bushy growth habit. Alternanthera is generally left alone by most pests and diseases. Consider mulching to help retain moisture and keep roots cool.