Each plant is unique. Size, shape, fullness, and variegation will vary.
Long, deeply serrated leaves combined with unpredictable cream, yellow, lime, orange and green variegation give this Philodendron a completely different appearance from the smoother-leaved variegated hybrids. New leaves can emerge with warm yellow, orange or copper tones before hardening, while older foliage develops its own combination of green and variegation. The exact breeding history behind ‘Ring of Fire’ is not reliably documented enough to assign specific parent species, so its dramatic leaf shape and multicolored variegation are the characteristics that define it in cultivation.
Young plants begin relatively compact, with smaller leaves and shallow serrations. As the plant matures, the leaves become considerably longer and the margins develop the deeper, more dramatic tooth-like divisions associated with mature specimens. Growth develops along a central stem and aerial roots can form at the nodes. A vertical support can help stabilize an older plant and give the stem and aerial roots somewhere to attach as the foliage becomes larger and heavier.
For natural light indoors, place it directly in an east-facing window or approximately 1–2 feet from a south-facing window. It prefers approximately 1,000–2,000 foot-candles at the leaves. Foot-candles simply tell you how much light is actually reaching your plant. The green portions of each leaf are responsible for most of the photosynthesis, so a heavily variegated plant has less chlorophyll available than an all-green Philodendron. Strong usable light helps support that foliage, but stronger light does not create more variegation. If new leaves become progressively smaller, spacing along the stem increases or the plant begins reaching strongly toward the window, move it closer to its light source.
Under a grow light, use a full-spectrum 5000–6500K fixture positioned approximately 8–12 inches above the canopy, aiming for 1,000–2,000 foot-candles at the leaves. Kelvin describes the color of the light, while foot-candles tell you how much light is actually reaching the plant. Keep the fixture above the newest growth and raise it as the plant develops. Cream and yellow sections contain less chlorophyll than green tissue, so the goal is enough usable light to support the entire plant rather than trying to increase the amount of variegation with stronger light.
Water when your plant needs watered. Allow it to use a good portion of the available moisture before watering thoroughly again, but avoid repeatedly taking an actively growing plant to an extreme dry. Use a loose aroid mix with potting material for some moisture retention combined with chunky bark and perlite or pumice to create air space around the roots. As the root system becomes larger and the plant develops more foliage, water use can change considerably, so use the root zone and the plant itself rather than a calendar to determine when it is ready for water.
Watch the newest growth and the spacing along the stem. Each new leaf can contain a very different amount and pattern of variegation from the leaf before it, and warmer colors can change considerably as the leaf hardens. That progression is normal. Increasing internode spacing, smaller successive leaves or strong reaching can indicate that usable light has become too low. Browning on cream or yellow tissue can happen before damage appears on greener portions of the leaf and should be treated as a clue to evaluate the entire environment rather than a diagnosis by itself.
Success looks like strong roots, steady new growth, increasingly substantial leaves and progressively deeper serrations as the plant matures. A healthy specimen can carry leaves in several stages of color at once, with every new leaf adding a different pattern to the plant. The goal is not the maximum amount of variegation. Look for continued growth, increasing leaf size, healthy green tissue and a plant that continues developing its characteristic deeply cut mature foliage.
