Agave havardiana Glass Mts., TX - 2.5" Pot
Havard's Century Plant
Details30" tall x 36" wide (seed propagated). Havard's Century Plant is the "big boy" of the cold-hardy Agave, growing to an imposing size at maturity! A native species endemic to the Davis Mountains of west Texas, this succulent has proven itself to be a very cold-hardy garden resident. The massive leaves are particularly wide and fiercely-spined, so give it plenty of room, and keep it away from walks and entrance ways. Plant it with the Muhlenbergia, for a striking sculptural combination.
|Common Name||Havard's Century Plant|
|Botanical Name||Agave havardiana|
|Zones||5, 6, 7, 8, 9, 10|
|Light Requirements||Full Sun|
|Mature Height||30" tall|
|Mature Spread||36" wide|
|Ships As||Potted Plant|
|Planting Time||Spring / Summer, Fall|
|Soil Type||Low Fertility Soil, Well-Drained Soil, Sandy Soil|
|Soil Moisture||Drought Resistant / Waterwise|
|Amount of Rain||10 to 20", 20 to 30", 30 to 40" (with care)|
|Advantages||Deer Resistant, Attract Hummingbirds, Attract Birds, Bee Friendly, Rabbit Resistant, Easy to grow, Good for Containers, Native, Evergreen, Good Rockgarden or alpine plant, Pest / Disease Resistant|
|Ideal Region||Coastal California, Hot Desert, Suitable Above 7000 ft, Western Only|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||No|
Tips for Growing Cacti and Succulents
Cacti shipped early in the spring may be dormant. As the weather warms, these cacti will expand and green-up. Remember, after an initial watering to settle the soil around the roots, no further water should be applied until the weather warms up. If plants are dormant and the spring weather is rainy, protect the plants from too much moisture by covering them with a gallon plastic milk container with the bottom cut out. Leave the top off the jug so heat build up isn’t excessive in sunny weather.
All the species of hardy cacti and succulents require fast-draining soil.
Planting in the ground
Put the plants on a slope or raised area of the garden, not in a low spot which collects water. Select a bed with full sun exposure, preferably next to a south or west facing wall. These areas will provide extra winter warmth. In heavy clay soils, it is essential to replace half or more of the soil from a 10”x 10” or larger hole with coarse sand and gravel mixed thoroughly with the remaining soil to ensure adequate drainage. No compost should be added, only a small handful of Planters II and Yum Yum Mix®.
Planting in an outdoor pot or planter
Use a planting mix of 3 parts garden soil + 2 parts coarse sand + 2 parts coarse perlite (or similar material). When growing plants indoors in pots, use a good quality potting soil to mix with the sand, and expanded shale instead of garden soil.
1. Cacti, agaves, and tap-rooted succulents (Aloinopsis, Titanopsis, Nananthus) should be transplanted bare-root. Let the soil in the pot dry out for a few days. Then remove the pot and gently loosen the soil so it falls away from the roots. Trim off any broken roots. Bare root plants should then be planted into a shallow hole. Spread out the roots evenly and sprinkle the soil into the hole until full. The base of the plant should rest on top of the soil. Mulch with a 1⁄2”-1” thick layer of pea-sized gravel around the base of the plant to protect it from contact with soggy soil over the winter months. (See planting diagram on page 12 of our Planting Guide.)
2. Succulents with fibrous roots (Ruschia, Delosperma, Sedum, and others) need not be transplanted bare-root, instead, the root ball should be scored and roughed out like other perennials.
1. Bare-root cacti and tap-rooted succulents must not be watered right away, but should sit dry for a day or two to allow the roots to callus over any broken or damaged areas. Other succulents can be watered in right away. Water thoroughly with a mixture of SeaCom-PGR and Superthrive to stimulate strong new root growth. Water again with this mixture two weeks later.
2. Outdoor beds with new plants should be initially watered once every 5 to 7 days for the first month or so after transplanting. Cacti and succulents enjoy regular watering during the heat of the summer and will grow vigorously. After the first year, most cacti species need a good soaking only once every 2-4 weeks during the spring and summer if there has been no rain.
3. Potted plants require more frequent, regular watering, especially if the weather is hot and dry.
4. To prepare cacti and succulents for the approach of winter, begin withholding water in the fall so the plants can begin to dehydrate and shrivel. Plump, well watered plants are ripe for cold damage when temperatures plunge in late fall/early winter.
Cacti and succulents are very modest in their fertilizer requirements. When planted in the ground, fertilizing in spring with SeaCom-PGR and Yum Yum Mix® will encourage plentiful flowers and good stem growth. When planted in pots, remember to feed monthly with the same mixture as above, beginning in late summer.
Garden plants: Many cacti and succulents are quite cold hardy if kept dry in the cold winter and spring months. In areas that receive a lot of winter and spring moisture (especially rain), it is strongly recommended that plants be protected from cold, wet soil conditions. For example, a temporary cold frame can be constructed using pipe or PVC hoops covered with a clear plastic sheet to cover the entire bed. Or individual plants can be covered with plastic gallon milk jugs with the bottom cut out to keep the ground around the plants dry. Leave the top off the jug so heat build up isn’t excessive in sunny weather. Problems will occur if plants are in wet soil all winter or sit under melting snow for extended periods.
Potted plants: Should be moved under a roof overhang on the south or west side of the house or placed in a well ventilated cold frame. Water pots and other containers lightly a few times over the winter during warm spells.
All our cacti, agaves and succulents are seed-grown or cutting-grown in our greenhouses. Cacti and agave plants are 2-4 years old; succulents are 1-2 years old. Please, never collect cacti from the wild unless it’s to rescue plants from construction sites. Many species are close to extinction in their native habitats due to irresponsible collectors.
View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.
Plant Shipping: Buy now and we will ship your order at the ideal planting time for your region. Expected ship week will display on the cart at checkout after you enter your zip code. Spring-Planted Perennial and Bulb orders will ship from Feb 25 through mid-June, warmest zones first.
Most plant and bulb orders arrive within 2-6 days, or less, of leaving our greenhouses in Colorado. This prompt delivery is provided without additional express charges.
Grass Plugs Will ship at planting time in spring, beginning in late February.
Wildflower Seed & Grass Seed Orders ship within 2-3 days.
Standard shipping costs are $4.99 and up, depending on the size of the order.
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- Did Not Survive The Winte
Comments about High Country Gardens Agave havardiana:
Did not survive the zone 5 winter
- Primary use:
- Needs Perfect Location
- Snowy Years It Browns
- Southern exposure
- Well Training Soil
- Western Exposure
- With Boulders
Comments about High Country Gardens Agave havardiana:
I don't know of any agaves planted in landscape in SLC aside from mine. I'm sure they are used, but underutilized. I have tried several locations, and have lost a few, and have a few that thrive. The cold isn't the issue, my site is 7b. Through this process, I have found the most success by planting in the areas where snow melts quickly. These sites are on hillsides facing southwest, with 100-500 pound boulders. My soil is mostly silt with lots of rocks mixed in the soil, mostly 1-6 inch size. My current oldest and largest agave is a stricking A. havardiana purchased here, from HCG. It is 3-4 years old, volleyball sized, and has been exposed to a very snowy year with 60-70", a consistently cold year where shaded area were snow covered from Nov-April, and those years the plant suffered, and looked browned, spotted, and unhealthy. However, within a month of warm spring weather, it bounced back to health rapidly. I'll also mention that the site is most in dappled light with 4-6 hours of direct sun daily.
- Primary use:
Q & A
Suggested Companion Plants:
USDA Hardiness Planting Zones
To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
- If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
- If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
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