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The true leaves of my roselle seedlings are brownish at edges and discolored.enter image description hereenter image description here

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Something happened during the time of the 1st and 2nd set of leaves. Too hot? Too cold? I can see some sort of insect infestation, can't see very well but maybe white fly or mealy bug? That would account also for the 'sucked dry' of the first leaves. I don't see them on the new leaves. Look beneath the leaves just in case.

Cut the dead/dying leaves off at the stem, do not cut the new growth at the top of the trunk or main stem of this plant. Think of this plant a tree. You do not want to top this tree. One takes the branches off right at the trunk.

Looks to me that you are watering too much. I am glad you used potting soil I hope there are drainage holes, bottom of planter/pot raised slightly off the surface where it sits...an air layer between pot/planter and the surface that supports it... and absolutely NO rock or gravel below the soil and above the drain hole.

Your plants below the first leaves look extremely healthy. What are you doing for fertilizer? Do not add any more fertilizer for quite a while if at all for your season...where is it that you live? Cut back the water. Don't water until dry. These plants are succulents they store their own water and too much water will start root rot. Try to focus watering the root zone, wet but not sopping and slightly watering the rest of the soil where there are no roots as yet to suck up the water. Roots will drown and rot if the pore spaces hold water too long. Roots keep the water moving and draining. No roots means a water logged bog and drowning roots of plants.

  • Plants in Delhi, India. I haven't added any fertiliser to these except the compost that was originally there. The previous week was very hot for September with direct sunlight. Then once there was rain. Now temperature is a bit lowerThese were planted from seed 17 days back. I can see a black ants wandering in the potting mix and climbing on these. Seedlings planted in plain cocopeat trays have all green leaves. However, in another pot with same potting mix the leaves are discolored. The tub has 4 drainage holes in the middle with a plastic plate supporting it. – Aksh Sep 21 at 6:06
  • A week back there used to be very very tiny things that flew whenever any seedling was disturbed even a bit. Now those are not there. Moreover, September this time is unusually hot with temperature touching 35 degrees. – Aksh Sep 21 at 9:44
  • Edit- Added latest picture. I need to use plastic plates since the apartment owner does not allow plants without them. – Aksh Sep 21 at 9:45
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    Put a sheet of newspaper between the pot with drainage holes and the plastic plate. If the paper goes wet and soggy then the drainage holes are not doing their job. As @stormy says, the enemy here is too much water in the soil. – Colin Beckingham Sep 21 at 12:04
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    Yes you can use plastic pots. You could even find them 'used' at nurseries. Make sure you clean them with chlorine (not chloramine). Seedling trays are great to start seeds. The only way really to start seeds to make starts to acclimate and then plant outside in the garden proper. Plant ONE seed per seedling section in a seedling tray. Use a spray bottle to keep moist NOT wet as well as a plastic dome to hold the moisture in the 'system'. After seeding in little pots WITH POTTING SOIL, once the roots come out of the bottom, transplant in 4" pots with potting soil...then 6"... – stormy Sep 23 at 23:12

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