Product Field NotesCompanion Plants
Lemon Smoothie False Indigo: Butter-Yellow Spires That Meet Lavender
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Lemon Smoothie false indigo is a tall, elegant baptisia with long spikes of clear butter-yellow pea flowers. Its claim to fame is timing: it opens in early June, later than many yellow false indigos, and strong side branching keeps fresh spikes coming for an extended stretch. That puts its yellow right on top of lavender's first purple bloom, which is about as cheerful a color pairing as a sunny garden gets.
Lemon Smoothie at a glance
| Trait | What to expect |
|---|---|
| Botanical name | Baptisia 'Lemon Smoothie' |
| Flowers | Butter-yellow spikes 12 to 15 inches long, many side spikes |
| Foliage | Blue-green, three-parted leaves |
| Size | About 42 to 48 inches tall and wide |
| Bloom | Opens early June, peaks mid-June, long blooming |
| Hardiness | USDA zones 4 to 9 |
| Light | Full sun to part shade |
| Wildlife | Great for pollinators; deer resistant |
Where to put a four-foot perennial
Lemon Smoothie grows into a full, rounded, almost shrub-like mound, so think of it as structure. It works at the back of a border with lavender in front, as an anchor at the end of a lavender row, or as a single specimen in a meadow-style planting. Keep it a few feet away from the nearest lavender so it does not shade the smaller plants or block their airflow.
Both plants want sun, lean soil and good drainage, so they can share the same ground and the same watering plan. Lay out the spacing in the Companion Plant Planner before you dig.
Growing it well
- Site: full sun gives the sturdiest plant and the most spikes.
- Soil: lean to average and well drained; the main risk is root rot in soggy ground.
- Permanence: the deep taproot makes it drought tolerant but also means established plants dislike being moved.
- First years: expect a couple of seasons to settle in. Weed around it and water while young.
- Hot springs: individual spikes pass faster in a heat wave, so some years the show is shorter.
Seed pods and winter
After bloom, the plant stays a handsome blue-green mound all summer. Dark seed pods form and can be left standing for fall and winter interest. It is fully hardy in Michigan with no protection; just make sure water drains away from it in winter. Cut it back in late fall or wait until spring.
Cutting the spikes
Lemon Smoothie is rated good for cut flowers. Take a few long spikes when the bottom flowers have opened and pair them with fresh-cut lavender for a yellow and purple jar on the kitchen table. The Cut Flower Planner has more ideas for planning a cutting bed.
Frequently asked questions
How is it different from Lemon Meringue?
Both are yellow false indigos. Lemon Smoothie blooms later, has butter-yellow rather than lemon-yellow spikes on longer racemes, and forms a full, rounded mound rather than a wide vase.
Can I eat any part of it?
No. False indigo is ornamental and is considered mildly toxic if eaten.
Plug tray or bare root?
The 72-cell plug tray suits growers and large plantings. A bare root plant is the simpler choice for one specimen in a home garden. See each product page for current availability.
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