Big Bend Beardtongue, Harvard Penstemon
Penstemon havardii

Family: Plantaginaceae
Genus: Penstemon (PEN-stem-on) (Info)
Species: havardii (hav-AR-dee-eye) (Info)

Category:

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Where to Grow:

Unknown - Tell us

Height:

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

Spacing:

12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)

Hardiness:

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Sun to Partial Shade

Danger:

Unknown - Tell us

Bloom Color:

Red

Scarlet (Dark Red)

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Fall

Late Fall/Early Winter

Foliage:

Herbaceous

Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; direct sow after last frost

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Houston, Texas

Gardeners' Notes:

1
positive
0
neutrals
0
negatives
RatingContent
Positive

On Aug 26, 2006, dmj1218 from west Houston, TX (Zone 9a) wrote:

Harvard penstemon is the showiest of the native Texas scarlet penstemons and has been used by professional gardeners and landscape designers in Texas for many years. Keep it on the dry side (it can survive on only 10" of rainfall a year) or it easily can attain a height of 6 feet. It spends most of its life as a rosette of thick, pale leaves. After its done with its late spring bloom in Texas (April to June) you will probably want to cut back the stalks; although if you don't it will probably rebloom in October. Hummingbirds love this native penstemon. There are 3 other tall native Texas scarlet penstemons: P murrayanus, P. cardinalis, and P. barbatus. This is a seperate species from them with its own unique characteristics. This particular species is best reproduced from seed, transplants... read more