Mature size & growth rate

How big does Phlox drummondii 'Intensia Cabernet' (Phlox drummondii 'Intensia Cabernet') get?

Also called Intensia Cabernet Annual Phlox, Cabernet Drummond Phlox.

More about phlox drummondii 'intensia cabernet'

About Phlox drummondii 'Intensia Cabernet'

Phlox drummondii 'Intensia Cabernet' · also called Intensia Cabernet Annual Phlox, Cabernet Drummond Phlox · flowering

'Intensia Cabernet' is a vigorous annual phlox bearing masses of rich wine-red blooms over a tidy mounding habit from spring to frost. More heat- and humidity-tolerant than older phlox, it self-cleans, resists mildew well and flowers without deadheading. Pet-safe and pollinator-friendly, it suits containers, borders and baskets in full sun.

Mature size: 25-40 cm tall and 30-40 cm wide

Indoor size vs how big it gets in the wild

Phlox drummondii 'Intensia Cabernet' reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back. Indoors and in a pot, expect 25-40 cm tall and 30-40 cm wide. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Growth rate and years to mature

Phlox drummondii 'Intensia Cabernet' is a fast grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: feed every 2-4 weeks with a balanced liquid fertiliser through the growing season, or use slow-release granules at planting. steady feeding sustains the continuous flush; avoid heavy nitrogen, which favours leaves over blooms.

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

How to keep phlox drummondii 'intensia cabernet' smaller

You are not stuck with the maximum size. For phlox drummondii 'intensia cabernet' specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of phlox drummondii 'intensia cabernet' from the start — that is the most reliable size control for an annual.
Grow it in a smaller container to naturally limit how large it gets.
For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier.
Sow a little later or space plants closer if you specifically want smaller individual plants.

How to grow phlox drummondii 'intensia cabernet' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for phlox drummondii 'intensia cabernet' the accelerators are:

Full sun, warm soil and steady water are what drive a crop to full size fastest.
Sow at the right time for your zone so it gets the whole season to size up.
Feed appropriately for the crop and never let it check (stall) from drought or cold.

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

When phlox drummondii 'intensia cabernet' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for phlox drummondii 'intensia cabernet':

It sprawls beyond its bed or container before harvest — usually a spacing or support issue.
It flops or needs staking once it hits full height.
Once it has fruited or bolted, it is at its final size for good — the next plant is a new sowing.

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

Phlox drummondii 'Intensia Cabernet' size — frequently asked questions

How big does phlox drummondii 'intensia cabernet' get?

Phlox drummondii 'Intensia Cabernet' reaches 25-40 cm tall and 30-40 cm wide when grown indoors. It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Is phlox drummondii 'intensia cabernet' slow or fast growing?

Phlox drummondii 'Intensia Cabernet' is a fast grower. Expect a single growing season — it reaches full size in one year, then is done. Phlox drummondii 'Intensia Cabernet' reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back.

How long does phlox drummondii 'intensia cabernet' take to reach full size?

Roughly a single growing season — it reaches full size in one year, then is done. Light, pot size and feeding move that timeline more than anything else.

How do I keep phlox drummondii 'intensia cabernet' smaller?

Choose a compact or dwarf variety of phlox drummondii 'intensia cabernet' from the start — that is the most reliable size control for an annual. Grow it in a smaller container to naturally limit how large it gets. For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier. Sow a little later or space plants closer if you specifically want smaller individual plants.

How can I make phlox drummondii 'intensia cabernet' grow bigger or faster?

Full sun, warm soil and steady water are what drive a crop to full size fastest. Sow at the right time for your zone so it gets the whole season to size up. Feed appropriately for the crop and never let it check (stall) from drought or cold.