Philodendron radiatum leaves are dark green, deeply pinnatifid with 5 to 10 lobe segments on each side of the leaf, 15-101 cm long by 11-90 cm wide...
Philodendron radiatum also called as Philodendron augustinum, Philodendron impolitum, Philodendron polytomum, is a species of the genus Philodendron. This species was described by Heinrich Wilhelm Schott in 1853.
DESCRIPTION OF PHILODENDRON RADIATUM
Philodendron radiatum is native to Mexico to Northern Colombia. It is found growing in rain forest, forest and woodland in Belize, Colombia, Costa Rica, Guatemala, Honduras, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Nicaragua, Panamá at elevations of around 300 meters above sea level.
It is an evergreen epiphytic or hemiepiphytic, rarely terrestrial climber with appressed-climbing or creeping (terrestrial) stem and thick, 3-12 cm long, dark green to gray-green, sometimes scurfy and light brownish tan internodes. The leaves are 15-101 cm long by 11-90 cm wide, deeply pinnatifid with 5 to 10 lobe segments on each side of the leaf, semiglossy, acuminate to long-acuminate at apex, upper surface dark green, lower surface slightly paler.
This species blooms from the erect, 1-4 inflorescences per axil. The inflorescences are formed by the erect, cuspidate at apex, 11-25 cm long spathe and sessile to weakly stipitate, cylindrical to weakly tapered spadix and are held on the 2-12 cm long peduncle. The spathe are pale green to yellowish green, semiglossy, sparsely purplish dotted outside, pink to dull red or pale brownish (post anthesis) inside; spathe tube dark purple-violet or dark green, sometimes tinged purple-violet outside, dark purple-violet inside. All parts of plant contain calcium oxalate crystals, an irritant to the mouth and esophagus.
PHILODENDRON RADIATUM CARE AND CULTURE
Cultural information should only be used as a guide, and should be to be adapted to suit you. Your physical location; where you grow your plants, how much time you have to devote to their care, and many other factors, will need to be taken into account. Only then can you decide on the cultural methods that best suit you and your plants.
Light:
Philodendron radiatum grows best in bright and indirect sunlight. Exposure to the sunlight can causes a yellowish color in the leaves or a sunburn spot. Too little light can result in leggy growth with lots of space in between the leaves. Artificial light gives best results if natural light is not present. They can be very vigorous growers and need support to keep the stems from breaking. Provide a tree bark or strong, moss-covered support sunk into the pot for the aerial roots to attach to. Sphagnum moss wrapped around a wooden slat, secured with monofilament fishing line or nylon thread, will work well.
Rotate your plant periodically to ensure even growth on all sides and dust the leaves often so the plant can photosynthesize efficiently. When dusting the leaves, also take the opportunity to inspect the undersides and keep an eye out for pests.
Temperature:
This aroid grows well in normal to warm indoor temperatures 24-27ºC (75-80ºF). They cannot tolerate temperatures which drop below about 13ºC (55ºF). In mild, frost-free climates, the plant can be grown outside in shady spots. If grown outside, night temperatures down to around 15°C and day temperatures around 30°C are ideal.
Substrate and growing media:
Philodendron radiatum grows best in loose, well-drained soil which is rich high in organic matter. It also be grow in 100% sphagnum peat moss and mixtures such as peat-vermiculite or peat-perlite.
The plants benefit from repotting to a larger container when they become root bound and outgrow the original pot. A combination of half soil-based potting mixture and half leaf mould or coarse peat moss is used.
Move the plant into container one size larger only when their roots have completely filed the current one. This is done at any time of year except during the short rest period. After the long rest period the convenient pot size has been reach (probably about 25-30cm (10-12 inch)), an annual spring top-dressing with fresh potting mixture will help to keep the plat healthy. A container with drainage holes to prevent root rot is used. A cachepot is used if a decorative container is without drainage. It is necessary to cover the bottom of a cachepot with pebbles so as to keep the plant above the drainage water.
Watering:
Fertilizer:
Philodendron radiatum are considered heavy feeders. Regular feeding program with a nitrogen fertilizer will increase leaf size and produces a larger, healthier plant. Throughout the months while the plant is actively growing (from spring until fall) apply standard liquid fertiliser once every two weeks. It's a nice strategy to fertilize more frequently at half strength than to apply one strong dose. Plants which mainly grows in low-light conditions require less fertilization than actively-growing plants. Moist soil requires fertilizers to avoid injury to plant roots.
Pruning:
Use a sharp pruners or scissors to control the size and shape of the plant. You can remove entire leaves by cutting them off at the base of the leaf stem. You can also remove the lower leaves if you want to reveal the plant's stem. Always wear gloves when pruning and wash your hands and tools when finished. You don't want to get the sap in your eyes or mouth.
Pests and diseases:
No serious insect or disease problems is however reported. Watch for aphids, spider mites, mealy bugs and scale. Leaf spots may occur. Root rot can occur in overly moist soils. Small leaves or long spaces between leaves show that the plant need enough light to grow.
Propagation:
Cutting and layering are popular methods of Philodendron radiatum propagation. Try propagating them during the growing season. A small brown nubs are formed where the leaves meet the stem. These nubs, when in contact with soil or water, will grow roots. There are many ways to propagate this plant, the easiest being to cut a branch just below a root-nub and place it in water with a few pieces of horticultural charcoal to reduce the likelihood of rot. As soon the growth of new leaf takes place it is potted in the rich soil. Similarly it can also be propagated within its own pot by pinning vines at the root-nub to the soil with hairpins or bent wire. The root nub in contact with the soil will sprout new roots in a very short time. When the different parts of Philodendron species are rooted, the plant will greatly profited from misting several times a day.
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