Giant Century Plant
Agave salmiana · Asparagaceae
📷 Alberto Salguero · CC BY-SA 3.0
⚠️ Sève riche en oxalates ; irritation orale/digestive pour chiens/chats et enfants par ingestion/contact.
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around giant century plant and prepare for winter.
ID card
- Foliage
- Evergreen
- Flowering
- July to August
- Adult size
- Up to 2 m in height
- Growth
- Slow to moderate
- Hardiness
- Down to approximately -5 °C
- Origin
- Mexico (Salm region)
- Soil type
- Well-draining, rocky or sandy
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Agave salmiana becomes very tolerant once established. Plant in mineral soil, in full sun, and limit watering during establishment.
The common mistake
Watering an established agave regularly: leaves soften, yellow, and rot starts from the center at the first hint of winter moisture.
The pro's trick
Check the rosette in winter: if the heart leaves soften, stop all watering immediately and improve soil drainage.
Care
Light Exposure
Salm's agave demands full sun to thrive and develop its compact silhouette. Place it in a very bright location, ideally facing south or southwest. Partial shade is tolerable but will slow its growth and reduce its ornamental appeal.
Watering
Water moderately during the growing season (spring-summer), allowing the soil to dry between waterings. In winter, reduce watering considerably, or suspend it almost entirely. Excess water is the main enemy: overly moist soil promotes root rot.
Soil
Use a very well-draining substrate made up of cacti potting mix combined with sand, perlite or gravel. In the ground, loosen the soil and improve drainage if necessary. Agave tolerates poor and rocky soils.
Fertilizer
Apply diluted fertilizer for succulents or cacti once or twice in spring-summer, during the active growing phase. No application is needed in autumn-winter. Overfeeding is not desirable: this plant has modest nutrient requirements.
Pruning
Salm's agave requires virtually no pruning. Simply remove dead, damaged or diseased leaves at the base. Wear thick gloves: its leaves are armed with sharp spines. After flowering, the mother rosette may naturally decline.
Diseases and Pests
Watch for mealybugs or soft-bodied insects in dry or warm environments. Soft or black rot generally reveals excessive moisture or poor drainage. Isolate any affected plant and correct the growing conditions.
Did you know?
Salm's agave owes its name to German botanist Dyckia Salm-Dyck, a great collector of succulents in the 19th century. In Mexico, this species is traditionally used for pulque production, a fermented beverage, though less well-known than blue agave. The spectacular candelabra-like flowering can measure several meters and only occurs after 10 to 15 years of growth.
Where to buy it
Plant in spring, once all risk of frost has gone. Pick a plant with healthy foliage and roots that are not exposed. Best time: from April to June.
Add this plant to my garden →Plants from the same family
- Lily of the valleyConvallaria majalis
- Spiny-headed Mat-rushLomandra longifolia
- Siberian squillScilla siberica
- Century plantAgave americana
- Sea squillDrimia maritima
- Armenian grape hyacinthMuscari armeniacum
Tips generated and checked by Viridia — adapt them to your local climate.