Product Field NotesCompanion Plants
Indigo Spires False Indigo: A Shrub-Sized Partner in Purple
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Indigo Spires false indigo is a baptisia that skips the awkward bare-legged phase. Its glaucous blue-green leaves cover the stems nearly to the ground, forming a dense, fully rounded clump 3½ to 4 feet tall and about as wide. In early June, 12 to 15 inch spikes of deep violet purple flowers with small yellow accents radiate from the whole dome, not just the top.
At that size it can stand in for a shrub, and it lives for many years with very little fuss. For a lavender grower, it is the rare large plant that wants exactly the same ground.
Indigo Spires at a glance
| Trait | What to expect |
|---|---|
| Botanical name | Baptisia 'Indigo Spires' |
| Flowers | Deep violet purple with yellow accents, 12 to 15 inch spikes |
| Foliage | Glaucous blue-green, dense to the ground |
| Size | 42 to 48 inches tall, about 42 inches wide |
| Bloom | Three to four weeks from early June, peaking mid-June; secondary spikes into midsummer |
| Hardiness | USDA zones 4-9 |
| Light | Full sun to part shade |
| Wildlife | Great for pollinators; deer resistant |
Layering purple with lavender
Indigo Spires opens in early June and overlaps the start of lavender season, so you get two purples at once: the deep violet of the baptisia behind and the softer lavender in front. Because it is so much taller, set it at the back of the bed or use one as a corner anchor where a shrub might otherwise go. The blue-green foliage stays full after bloom and blends with silver lavender leaves for the rest of the season.
Both plants are lean-soil, low-water growers, which keeps the whole bed on one care routine. Use the Companion Plant Planner to place it with enough room for lavender to get full sun and airflow.
Planting and care
- Permanent spot: the deep taproot means established plants do not like to be moved.
- Soil: lean to average, well drained. Soggy winter soil is the main cause of loss.
- Water: help it through the first couple of seasons, then it handles drought.
- Settling in: expect a couple of seasons before it fills out. It is worth the wait.
- Airflow: give it room in humid summers so the foliage stays clean after bloom.
- Fall: cut back in late fall, or leave the stems and seed pods standing until spring.
Cut stems and seed pods
The long spikes are good cut flowers in June, and the dark seed pods later make interesting dried material. False indigo is ornamental only; it contains alkaloids and is considered mildly toxic if eaten.
Plug tray or bare root
Indigo Spires is offered as a 72-cell plug tray for growers and large plantings, and as a bare root plant for a single specimen. See each product page for current availability, or visit the Wholesale Hub for trays.
Frequently asked questions
How is it different from other false indigos?
Its leaves reach far down the stems and its flower spikes appear all around the plant, so it looks full from every side rather than leggy at the base.
Does it bloom more than once?
The main show lasts three to four weeks, and secondary spikes may carry some color into midsummer.
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