Repotting guide

When & how to repot Philodendron 'Dean McDowell' (Philodendron 'Dean McDowell' (P. gloriosum × P. pastazanum))

Also called Dean McDowell Philodendron, Philodendron McDowell, McDowell Philodendron.

More about philodendron 'dean mcdowell'

About Philodendron 'Dean McDowell'

Philodendron 'Dean McDowell' (P. gloriosum × P. pastazanum) · also called Dean McDowell Philodendron, Philodendron McDowell · tropical

Philodendron 'Dean McDowell' is a rare aroid hybrid (gloriosum x pastazanum) prized for huge, velvety, white-veined heart-shaped leaves on a creeping rhizome. Give bright indirect light, a chunky moist aroid mix, warmth and high humidity. It is toxic: the ASPCA lists Philodendron as toxic to cats and dogs.

Mature size: Leaves commonly reach 40-60 cm long indoors (larger in ideal conditions); the rhizome can spread up to ~1 m wide over years. A slow grower best suited to wide, shallow planters rather than tall pots.

How to tell philodendron 'dean mcdowell' needs repotting

Repotting on a calendar is less reliable than reading the plant. For philodendron 'dean mcdowell', watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for philodendron 'dean mcdowell') flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 philodendron 'dean mcdowell'

Only every 2–4 years, when genuinely crowded. Philodendron 'Dean McDowell' is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Terrestrial, creeping rhizomatous perennial that grows horizontally rather than upward. The rhizome crawls along the soil surface, sending up oversized heart-shaped leaves (pink when new, maturing deep green with bold pale veins) along its length..

What size pot to step philodendron 'dean mcdowell' up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Philodendron 'Dean McDowell' positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping philodendron 'dean mcdowell' into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 philodendron 'dean mcdowell'

Early spring, just as new growth restarts, is the ideal window for philodendron 'dean mcdowell'. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting philodendron 'dean mcdowell'

Confirm it actually needs it. Slide philodendron 'dean mcdowell' out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip philodendron 'dean mcdowell' out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh chunky, well-aerated aroid mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water philodendron 'dean mcdowell' again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for philodendron 'dean mcdowell'

Philodendron 'Dean McDowell' wants chunky, well-aerated aroid mix. Use a loose blend of orchid bark, perlite or pumice and coco coir/peat with some worm castings. Excellent drainage and air to the roots is essential; the rhizome should sit on top of the substrate, not be buried. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting philodendron 'dean mcdowell' — frequently asked questions

How often should you repot philodendron 'dean mcdowell'?

Only every 2–4 years, when genuinely crowded for philodendron 'dean mcdowell'. Only repot philodendron 'dean mcdowell' every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using chunky, well-aerated aroid mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does philodendron 'dean mcdowell' need?

When is the best time of year to repot philodendron 'dean mcdowell'?

Does philodendron 'dean mcdowell' like to be root-bound?

Yes — philodendron 'dean mcdowell' genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise philodendron 'dean mcdowell' after repotting?

Not immediately. Wait about 4 weeks after repotting philodendron 'dean mcdowell'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.