Magnesium Deficiency on Aglaonema Super White: Causes
Quick answer
Magnesium deficiency on Aglaonema Super White shows as yellow or pale green tissue between dark green veins on the oldest lower broad leaves while rosy-white variegation patches stay unchanged and the crown may still push normal-looking new spears. First step: confirm interveinal chlorosis on mature lower blades—not yellow new tips with green veins at the crown.
Magnesium Deficiency on Aglaonema Super White: Causes, Checks & Fixes
This guide covers magnesium deficiency on Aglaonema Super White. See also the general Magnesium Deficiency guide, watering, and light pages for this plant.
Magnesium Deficiency on Aglaonema Super White: Causes, Checks & Fixes
Quick answer
Magnesium deficiency on Aglaonema ‘Super White’ shows as yellow or pale green tissue between dark green veins on the oldest lower broad leaves while rosy-white variegation patches stay unchanged and the crown may still push normal-looking new spears. Magnesium is highly mobile in plants, so deficiency symptoms appear first on lower leaves as the clump relocates magnesium to younger crown tissue.
See our magnesium deficiency guide and the magnesium deficiency symptom hub. On Super White, inspect the lowest mature blades on the clump—interveinal yellow bands across the green sectors of variegated leaves are classic magnesium before iron deficiency, which hits new unfurling tips with green veins.
First step: confirm interveinal chlorosis on older lower broad leaves, not on the newest crown spear still opening.
When to use this page vs other Super White guides
| Pattern | Read next |
|---|---|
| Yellow between veins on oldest lower blades | Magnesium deficiency (this page) |
| Yellow new blade with green veins at crown tip | Iron deficiency |
| Uniform pale lower old blades without vein pattern | Nitrogen deficiency |
| Brown scorch at margins on older blades | Potassium deficiency or Brown tips |
| Cupped or margin-burned newest crown blade | Calcium deficiency |
| Yellow lower leaves on wet mix | Overwatering or Root rot |
| White fading to green on new growth | Not enough light or Pale leaves |
| Multiple yellow causes at once | Yellow leaves |
What magnesium deficiency looks like on Aglaonema Super White
Super White carries broad glossy leaves splashed rosy-white, cherry-red, and green on an upright clump. The white zones lack chlorophyll, so magnesium stress shows on the green sectors of mature foliage lower on the clump, not as fading white patches. Healthy blades hold crisp veining from crown to soil line. Magnesium stress breaks that pattern on mature foliage lower on the clump, not at the active crown spear.
Older broad blade with dark green veins and yellow-green bands between them on green tissue—rosy-white patches adjacent may look unchanged while newer crown blades above stay normal.
Typical signs:
- Yellow or pale green between dark green veins on oldest lower broad leaves
- Veins and green splashes stay relatively dark on mature blades—classic interveinal banding across the mid-blade
- Rosy-white and cherry-red variegation patches often look unchanged because they already lack chlorophyll
- New crown spears may look normal in early stages while lower canopy shows chlorosis
- Firm stems and crown unlike mushy overwatered Super White on soggy mix in dim light
- Symptoms climb upward over weeks as the plant strips magnesium from old to new tissue
- No cupping or hood-like margin burn on the newest unfurl—that pattern points to calcium deficiency
Not magnesium deficiency:
- Yellow new blades with dark green veins at the softest unfurling crown tip—iron deficiency (iron affects youngest leaves first)
- Uniform pale lower blades without a strong vein-retention pattern—nitrogen deficiency
- Cupped or necrotic margins on the newest crown spear while older blades look fine—calcium deficiency
- Brown crispy edges without interveinal mid-blade banding—brown tips or potassium deficiency
- All blades yellow at once on persistently wet soil—overwatering or root rot
- White reverting to all-green on new growth—not enough light, not magnesium
- One bottom blade yellow while a green spear unfurls above—often normal senescence; see yellow leaves
RHS notes interveinal chlorosis from manganese, iron, or magnesium deficiency, with manganese and magnesium symptoms tending to start on older leaves. On a slow variegated aglaonema, that older-leaf banding is easiest to read on the green sectors of broad blades closest to the pot rim.
Why Aglaonema Super White gets magnesium deficiency
Super White is a tissue-cultured Thai hybrid that needs brighter indirect light than green Chinese evergreens to hold its rosy-white color. Magnesium sits at the center of the chlorophyll molecule, and when soil reserves run low the clump strips it from older broad tissue to fund the one or two new crown spears it pushes per warm season.
Super White-specific causes:
- Leached peat-perlite mix — Thorough watering per the Super White watering guide drains soluble magnesium through drainage holes. Years in the same pot without complete feed leaves interveinal chlorosis on lower blades while the crown still looks glossy.
- Nitrogen-heavy fertilizer without micronutrients — Slow feeders tolerate neglect, but nitrogen-only products let the clump keep pushing broad blades while magnesium in the root zone depletes.
- Hard tap water and calcium competition — Conditions that lead to magnesium deficiency are often related to fertilizer programs that supply too little Mg, or when Ca and K compete with Mg for uptake.
- Years without repotting — A clump in depleted peat-perlite mix can show lower-leaf banding even when care looks stable on the surface.
- Blocked uptake from wet roots — Chronic saturation in a cachepot in dim light prevents absorption even when magnesium is present; see overwatering before drenches.
- Salt crust without magnesium replacement — White rim buildup from hard water or excess feed can injure roots and block micronutrient uptake. UF/IFAS warns over-fertilization indoors causes soluble salt buildup and leaf margin injury on Aglaonema.
Do not diagnose magnesium deficiency on sour wet soil with soft stems at the base—that is root failure until you confirm mostly white firm roots.
Green-sector interveinal bands on the lowest clump row
Magnesium deficiency on Super White shows on the oldest broad leaves closest to the pot rim—a pattern that would be nonsense on a snake plant rosette or a dracaena cane crown. The dark green base and cherry-red splashes along the veins make interveinal chlorosis highly visible on green tissue: green veins with yellow-green bands between them across the mid-blade, while adjacent rosy-white patches may look unchanged because they never held much chlorophyll to begin with.
That lower-clump locus distinguishes magnesium from iron, which appears on the blade still unfurling at the crown tip. It also differs from calcium, which cups or burns the newest expanding crown spear while older blades stay normal. Magnesium deficiency initially develops on lower or older foliage and can advance up the clump as symptoms worsen.
Because Super White blades are broad and upright, one chlorotic lower leaf with clear vein retention is enough to anchor your diagnosis before changing fertilizer, mix, or pot size.
Fluoride-avoidance soft water and leached magnesium
Super White is fluoride-sensitive like other Aglaonemas, so many owners switch to distilled, reverse-osmosis, or heavily filtered water to prevent brown tips. That routine increases how much magnesium you must replace through fertilizer, because each thorough watering per the top 2–3 cm dry-down rhythm flushes soluble nutrients through airy peat-perlite mix.
The fix is not to skip watering or pour full-strength feed on pale tissue. It is to apply one measured Epsom drench or quarter-strength complete fertilizer with magnesium on moist mix during active growth per the Super White fertilizer guide while keeping filtered water for routine drinks. Clemson HGIC recommends filtered or rested tap water for tip burn on Chinese evergreen—pair that switch with complete micronutrient feeding so lower blades do not band between veins after seasons of leaching.
Bright-light slow flush and magnesium timing
Variegated Super White needs 150–300 foot-candles of bright filtered light to hold white color, which is more than green cultivars tolerate in dim offices. That brighter placement speeds water use compared with a dark hallway—but the plant still pushes only one or two new crown spears per warm season when stable. Each chlorotic lower blade represents weeks of depleted magnesium in the root zone, not a one-day mistake.
A plant in appropriate bright indirect light still needs consistent complete feeding during active growth. Skipping feed because growth looks slow, then dumping full-strength fertilizer after interveinal banding appears, often scorches pale tissue without fixing chlorophyll formation in the next spear. UF/IFAS recommends 20-20-20 at 50 ppm nitrogen about once monthly under interior conditions—skipped seasons matter on slow feeders.
Closing the gap means stable top 2–3 cm dry-down per the watering guide and quarter-strength complete fertilizer with magnesium during active growth, not more nitrogen to force wider blades the chlorophyll cannot support.
Crown spear vs lower blade: magnesium vs iron vs calcium
Super White invests the most new tissue at the active crown spear each warm season. Iron demand peaks there; magnesium deficiency does not—it starts below.
When the lowest mature broad leaves show interveinal yellowing on green sectors but the newest unfurling blade at the crown stays evenly green (or only briefly lime before hardening), magnesium is the likely mobile-nutrient issue. When new blades emerge yellow with dark green veins while older blades stay normal, switch to the iron deficiency page.
When the newest crown blade cups inward or browns at the margin while older variegated blades look fine, that is calcium deficiency—immobile calcium hits expanding tissue first, not mobile magnesium on mature lower blades.
Penn State magnesium deficiency work notes bright yellow interveinal chlorotic lesions on older leaves—on Super White those lesions read clearly against the dark green splashes on variegated tissue.
Lookalike symptoms
| Pattern | Check | Likely cause |
|---|---|---|
| Interveinal yellow on oldest lower blades | Leaf position | Magnesium deficiency (this page) |
| Yellow new blade, green veins at crown | New vs old tissue | Iron deficiency |
| Cupped newest crown blade | Expanding tip | Calcium deficiency |
| Pale lower blades without vein bands | Uniform wash | Nitrogen deficiency or Pale leaves |
| Brown margins without mid-blade banding | Edge pattern | Brown tips or Potassium deficiency |
| Soft stems, wet soil, mushy base | Root feel | Overwatering |
| White fading on new growth | Light level | Not enough light |
| Speckled upper blades | Leaf position | Manganese deficiency (rare indoors; upper-leaf pattern per UF/IFAS) |
How to confirm
- Old vs new tissue — Interveinal chlorosis confined to oldest lower blades while the crown spear looks normal strongly suggests magnesium.
- Vein pattern — Dark green veins with yellow between them across the mid-blade on green sectors, not uniform pale wash.
- Variegation check — Rosy-white patches unchanged while green tissue bands between veins—typical magnesium on variegated aglaonema.
- Fertilizer history — Complete feed with micronutrients vs nitrogen-only products or years without any feed.
- Mix age — Same peat-perlite pot for three or more seasons without refresh or repotting.
- Root health — Firm crown and white roots vs brown mush from soggy soil in dim light.
- Watering rhythm — Mix staying wet for weeks in low light blocks uptake even when magnesium is in the bottle.
- Symptom climb — As magnesium deficiency progresses, interveinal chlorosis advances up the clump to mid-canopy blades.
First fix for Aglaonema Super White
One measured Epsom salt (magnesium sulfate) drench at 1 tablespoon per gallon of water on already-moist mix—only after confirming interveinal chlorosis on older lower blades (not new crown tips), firm roots, and stable top 2–3 cm dry-down rhythm.
Do not repot, prune, and triple-feed a recently relocated clump the same week. Stabilize watering per the Super White watering guide first—water when the top 2–3 cm of mix dries, empty saucer standing water within 30 minutes after each drink.
If you prefer not to use Epsom salt, one quarter-strength dose of complete balanced fertilizer listing magnesium on the label on moist mix is an alternative—pick one route, not both the same week.
Step-by-step recovery
- Rule out iron deficiency by comparing oldest lower blades to the softest crown unfurl—iron hits new tips; magnesium hits old blades.
- Apply one Epsom drench (1 tbsp magnesium sulfate per gallon) or quarter-strength complete feed with magnesium on moist mix.
- Maintain consistent top 2–3 cm dry-down—uptake fails when roots alternate between saturated and desiccated in a heavy pot on a dim shelf.
- Flush white salt crust at the pot rim before resuming feeding if buildup blocks uptake.
- Repot into fresh peat-perlite mix if roots fill the pot and banding persists after one measured correction on healthy roots—see Super White repotting.
- Monitor the next one or two crown spears—chlorotic lower blades rarely re-green; recovery shows on subsequent new growth with crisp rosy-white variegation.
- Resume light complete feeding at six- to eight-week intervals through active growth per the fertilizer guide if the next spear responds.
Recovery timeline
Chlorotic bands on old broad leaves rarely return to full green once tissue hardens. The next one or two crown spears after corrected feeding and stable watering usually open with normal rosy-white and green variegation within six to ten weeks on firm roots—slower than fast-growing pothos because Super White pushes new tissue less often in bright filtered light.
Severe root damage from chronic overwatering in dim corners may delay recovery a full growing season. If interveinal chlorosis keeps climbing to mid-canopy blades despite one Epsom drench and stable care, inspect roots for rot before repeating drenches or repotting again.
Mistakes to avoid
- Do not treat yellow new crown tips with green veins as magnesium—switch to iron deficiency diagnosis.
- Do not heavy-feed a clump on wet soil in low light—fix drainage before fertilizer.
- Do not stack Epsom drench, full-strength feed, and repotting the same week on a stressed plant.
- Do not expect current chlorotic lower blades to re-green—judge the next crown spear unfurl.
- Do not confuse cupped newest crown blades with magnesium—see calcium deficiency.
- Do not confuse white fading to green on new growth with magnesium—see not enough light.
- Do not skip feeding for years then dump full-strength fertilizer on a pale clump—that path burns margins without fixing interveinal banding.
Prevention
- Feed lightly with complete balanced fertilizer including magnesium during active growth per the Super White fertilizer guide—UF/IFAS recommends balanced feed at modest ppm under interior conditions.
- Maintain consistent top 2–3 cm dry-down per the watering guide.
- Refresh depleted peat-perlite mix every one to two years when roots crowd the pot.
- Flush salt buildup mid-season if you use hard tap water or feed heavily.
- Inspect lower blades monthly during spring and summer—early interveinal banding on green sectors is easier to correct than a chlorotic mid-clump.
- Keep the clump in enough filtered light for firm broad blades—not a dark closet where white fades to green; see light guide.
Related Aglaonema Super White guides
- Aglaonema Super White overview
- Super White problems hub
- Super White fertilizer
- Super White watering
- Super White soil
- Iron deficiency — new blade yellow with green veins
- Calcium deficiency — cupped newest crown blade
- Nitrogen deficiency — uniform pale lower blades
Use the Fertilizer Dilution Calculator to work out a safe quarter-strength dose before changing multiple variables at once.
Conclusion
Yellow between dark green veins on the oldest lower Super White broad leaves points to magnesium uptake failure on mobile-nutrient tissue—confirm the old-vs-new blade pattern, rule out iron on the crown tip and calcium cupping on the newest spear, stabilize top 2–3 cm dry-down watering and root health, apply one measured Epsom drench or complete feed with magnesium, and judge recovery by the next crown spear unfurl.