Repotting guide

When & how to repot Ithuriel's Spear (Triteleia laxa)

Also called Ithuriel's spear, Grassnut, Triplet lily, Wild hyacinth.

More about ithuriel's spear

About Ithuriel's Spear

Triteleia laxa · also called Ithuriel's spear, Grassnut · flowering

Triteleia laxa is a cormous perennial native to grasslands and open woodlands of California and southern Oregon, producing open umbels of funnel-shaped, pale to deep violet-blue flowers on tall, wiry stems in late spring and early summer as the grass-like leaves die back. It is a tough, drought-tolerant bulb that thrives in full sun to part shade in light, free-draining soil and is well suited to naturalising in gravel gardens, dry borders, and rock gardens. The corms need a dry summer dormancy and should not be overwatered. No formal ASPCA listing for toxicity has been found; treat with caution and classify as mildly-toxic.

Mature size: 30–60 cm tall in flower, naturalising into spreading clumps over time

How to tell ithuriel's spear needs repotting

Repotting on a calendar is less reliable than reading the plant. For ithuriel's spear, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot ithuriel's spear

Every 2–3 years, into bone-dry mix. Ithuriel's Spear's growth habit — cormous perennial with narrow, grass-like basal leaves 20–40 cm long that begin to die back as the leafless flower stems rise; stems reach 30–60 cm tall, topped with a rounded umbel of 6–20 flowers. — sets the pace. Triteleia laxa is a cormous perennial native to grasslands and open woodlands of California and southern Oregon, producing open umbels of funnel-shaped, pale to deep violet-blue flowers on tall, wiry stems in late spring and early summer as the grass-like leaves die back. It is a tough, drought-tolerant bulb that thrives in full sun to part shade in light, free-draining soil and is well suited to naturalising in gravel gardens, dry borders, and rock gardens. The corms need a dry summer dormancy and should not be overwatered. No formal ASPCA listing for toxicity has been found; treat with caution and classify as mildly-toxic.

What size pot to step ithuriel's spear up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Ithuriel's Spear stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot ithuriel's spear

Spring or summer, while ithuriel's spear is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting ithuriel's spear

Repot dry. Do not water ithuriel's spear for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty light, sandy, well-drained, fertile ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set ithuriel's spear at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep ithuriel's spear completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for ithuriel's spear

Ithuriel's Spear wants light, sandy, well-drained, fertile. Plant corms 10–12 cm deep in autumn in free-draining sandy or gritty soil; Triteleia laxa is intolerant of heavy, wet soils. Add horticultural grit to heavy borders before planting. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting ithuriel's spear — frequently asked questions

How often should you repot ithuriel's spear?

Every 2–3 years, into bone-dry mix for ithuriel's spear. Repot ithuriel's spear every 2–3 years into a snug pot of light, sandy, well-drained, fertile, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does ithuriel's spear need?

When is the best time of year to repot ithuriel's spear?

Should you water ithuriel's spear after repotting?

No — not straight away. Repot ithuriel's spear into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise ithuriel's spear after repotting?

Not immediately. Wait about 3 weeks after repotting ithuriel's spear. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.