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Lobelia siphilitica
Lobelia siphilitica
Garden Diary

Date purchased or acquired:

Where acquired:

Location in the garden:


The next time you are buying perennials please look for our helpful labels and blue pots, and remember "The best perennials come out of the blue"!

Lobelia siphilitica

Giant Blue Lobelia

USDA Zone: 4-9

Plant number: 1.328.500

The perennial Lobelias have upright spikes of large flowers, not at all like the more familiar trailing types grown in hanging baskets. This easy-to-grow native species bears heads of dark blue to white flowers through late summer and fall, over dark-green leaves. Plants will usually self-sow, and the seedlings are easily moved while still small. Clumps may also be divided in early spring. Much more perennial in habit than most of the other hardy types. Attracts both butterflies and hummingbirds. Excellent for cutting. CAUTION: Harmful if eaten.

Further details for
Lobelia siphilitica

Optimal Growing
Appearance and
Sun Exposure
  Full Sun or
  Partial Shade
Soil Type
  Normal or
  Sandy or
Soil pH
  Neutral or
  Alkaline or
Soil Moisture
  Average or
Care Level
Flower Colour
  Deep Blue
  Light Blue
Blooming Time
  Mid Summer
  Late Summer
  Early Fall
  Mid Fall
Foliage Color
  Deep Green
Plant Uses & Characteristics
  Accent: Good Texture/Form
  Attracts Butterflies
  Attracts Hummingbirds
  Cut Flower
  Wild Flower
   60-90 cm
   23-35 inches
   30-60 cm
   12-23 inches
Foot Traffic
Growth Rate
Disclaimer: This information is presented for reference only. This plant is not currently part of our Heritage Perennials lineup.