Mature size & growth rate

How big does Daylily 'Ruby Spider' (Hemerocallis 'Ruby Spider') get?

Also called Ruby Spider Daylily, Giant Spider Daylily.

More about daylily 'ruby spider'

About Daylily 'Ruby Spider'

Hemerocallis 'Ruby Spider' · also called Ruby Spider Daylily, Giant Spider Daylily · flowering

Ruby Spider is a spectacular large-flowered spider daylily producing enormous ruby-red blooms up to 28 cm across on 90 cm scapes. The long, narrow, recurving petals give it an exotic, starfish-like appearance. A mid-season bloomer and show-garden favourite. TOXIC — all Hemerocallis are potentially deadly to cats.

Mature size: 85-100 cm tall in bloom; clumps 75-100 cm wide

Watch for — Scape lodging (flopping): Very tall scapes may need staking in windy sites. Use bamboo canes and ties; or choose a sheltered position.

Indoor size vs how big it gets in the wild

Daylily 'Ruby Spider' stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward. Indoors and in a pot, expect 85-100 cm tall in bloom. In the ground with no restriction it is a completely different plant — clumps 75-100 cm wide — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Growth rate and years to mature

Daylily 'Ruby Spider' is a moderate grower. Realistically, expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Its feeding profile backs this up: feed with a balanced granular fertiliser in spring, then switch to a high-potassium bloom formula during bud development to maximise flower size. a slow-release granule applied once in spring can be combined with liquid feeds every 2-3 weeks during peak growth.

Want this turned into the right next pot at the right moment? The pot size calculator and the daylily 'ruby spider' repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast daylily 'ruby spider' grows.

How to keep daylily 'ruby spider' smaller

You are not stuck with the maximum size. For daylily 'ruby spider' specifically, these are the levers, in order of impact:

Divide the clump every year or two — splitting daylily 'ruby spider' is the main way to control its spread and refresh it.
Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump.
Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

The keep-it-smaller method, step by step

Lift the whole plant. Slide daylily 'ruby spider' out of its pot in spring when the clump has filled it.
Split the clump. Tease or cut the rootball into two or more sections, each with healthy roots and growth.
Repot one division. Put a single division back in the original pot to reset it to a smaller size; pot or give away the rest.
Remove offsets as they form. Through the year, detach new runners or pups to stop it spreading again.

How to grow daylily 'ruby spider' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for daylily 'ruby spider' the accelerators are:

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Good light plus regular feeding maximises offset and runner production.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

Light is almost always the ceiling. The daylily 'ruby spider' light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When daylily 'ruby spider' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for daylily 'ruby spider':

The clump bulging over the pot rim or splitting the pot — the cue to divide, not to find a bigger room.
A dense centre that goes bare or tired while the edges keep spreading.
Runners or offsets escaping across the shelf or into neighbouring pots.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the daylily 'ruby spider' repotting guide. If you want more of this plant instead of a bigger one, the daylily 'ruby spider' propagation guide turns prunings into new plants.

Daylily 'Ruby Spider' size — frequently asked questions

How big does daylily 'ruby spider' get?

Daylily 'Ruby Spider' reaches 85-100 cm tall in bloom when grown indoors, and far larger where it grows unrestricted (clumps 75-100 cm wide). Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Is daylily 'ruby spider' slow or fast growing?

Daylily 'Ruby Spider' is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Daylily 'Ruby Spider' stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward.

How long does daylily 'ruby spider' take to reach full size?

Roughly three to six years to reach mature indoor size, gaining a steady amount each growing season. Light, pot size and feeding move that timeline more than anything else.

How do I keep daylily 'ruby spider' smaller?

Divide the clump every year or two — splitting daylily 'ruby spider' is the main way to control its spread and refresh it. Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump. Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

How can I make daylily 'ruby spider' grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Good light plus regular feeding maximises offset and runner production. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.