Purple tips/margins

jacockstarted grow question 7mo ago

Hi, im at day 60 indoor soil (biobizz all mix). Fert with fish mix, bio heaven, activera and rootjuice. Since first weeks old big leaves had some brown spot with yellow "aura" but plants still growing strong. Now young/newborn leaves are growing with purple tips and margins, and

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Leaves. Tips · Burnt

Leaves. Color · Dark-purple

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Ultravioletanswered grow question 7mo ago

Most likely exceeded buffering capacity of the medium. You are using all mix which is a highly pre charged medium with a EC of over 1.8ms/cm or over to begin with. Most likely have been fertilizing more and more organic matter faster than your plant is using nutrients through growth. Anthocyanin(purple) accumulates in plants that are experiencing a scarcity of nitrogen. Chances of your plant actually being short on nitrogen is slim to none. Means its locked out by one mechanism or another. I see leaves laden with water as the cycle starts to break down. Potential high ec as leaf tips look to be showing high salinity. Get your ph reading. I'd guess it skewed. Organic breakdown of nitrogen faster than it be used will skew ratio. Or a combination of fertilizing faster than medium/plant can utilize the salts/ec. Leading to eventual skew. Soon as pH skews on organic delivery nutrients its game over. Flush reset and reapply full balanced feed. If the nitrification process is hindered and NH4+ accumulates in the soil, it can cause antagonism with essential cations like calcium Ca2+Mg2+. Ammonium (NH4+) requires 4-5x more water to separate from soil particles. Flush accordingly. But its gonna destroy Micros. Gotta do what you gotta do.

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Xipsiomega1answered grow question 7mo ago

Heavy soil and heavy feeding. In my opinion pure water with correct ph and some Bacillus it;s the only thing you can do. Good luck!

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Terp1answered grow question 7mo ago

To me, it looks like the lady primarily has a potassium deficiency, with a small magnesium deficit as a passenger. The brown-rusty spots with yellow edges are mainly on older leaves and start near the edges – that's K-classic. The purple tips/edges on the new growth also fit with K/P-limitation, but they are often triggered by low temperatures: When the pots or the root zone drop to around 18 °C or below at night (cold soil, drafts, LED nights too cool), the plant slows down nutrient uptake, stores anthocyanins, and turns purple exactly at the edges. This explains why the edges turn purple at the top while the old leaves scar at the edges below. Add Bio-Bloom to get potassium (and a bit of phosphorus) in – for example, for the next two watering sessions, use Grow 2–3 ml/L + Bloom 1 ml/L. Secure magnesium with Cal/Mag 0.5–1 ml/L in the watering water. Keep the pH in soil at 6.2–6.7, water thoroughly, and let the pots really dry out between waterings so nothing gets blocked. The severely damaged old leaves won't heal, but you'll see it quickly on the new growth: no new edge burns and the purple margins will fade as potassium comes in and the nights/roots no longer cool down. Good Luck 👽

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00110001001001111Oanswered grow question 7mo ago

Second the temperature cause. If temps drop below 68F it increases it. Also, purple can be in some plants genetics. I'd assess the lushness under normal lighting. These plants do look a bit pale, but grow lights have that effect. I think it allows you to see hints of chlorosis long before you'd notice under normal room lighting. That does look like boron deficiency, but it is now an old leaf, so that's probably not an ongoing issue. Rare to have trace element issues. Usually lockout of some type - nutrient or pH. Soils should have plenty.. any soilless/hydro products should include them. If that's a bronze coloring, then Fe or Cl come into the picture.

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Core_T_Sonanswered grow question 7mo ago

What temperature does the soil have? Are you paying attention to enough calcium and magnesium? The purple coloring should be a sign of potassium deficiency, but that doesn't mean you're giving too little of it. The plant just can't access it... Next time you water, pay attention to the temperature (20°C), pH (6.5), and especially the calcium and magnesium levels, then it should change within a week.

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Organomananswered grow question 7mo ago

A few things going on, a lack of calcium and a general lack of N/P/K. Purple stems can be a sign of a phosphorous issue. I do not think the purple is due to temps, your plants are suffering from incorrect feeding.

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HighHolidaysanswered grow question 7mo ago

Could it be due to temperature? Based on the stem color and structure, that seems the most likely explanation. What temperatures are you running? When temperatures drop especially at night the plant produces less chlorophyll, allowing anthocyanins to become visible, which cause purple, reddish, or bluish tones. This happens more easily in strains with purple genetics. If the cold isn’t extreme, it’s not harmful and only affects color, not quality. However, very low temperatures or frost can damage the plant. 💨💨💨 Stay high

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