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Re: [SHADEGARDENS] primula japonica

Dear Mary;

 You wrote - "The
foliage of these are an unhealthy looking yellow color.  I have provided
them
with fertilizer, water and light but to no avail."


I thought others may also be interested in causes of yellowing leaves, so
I'm posting it to the entire robin.

1. Older yellow leaves/ new growth is green; this is a survival tactic of
a plant being starved for food, water or light. Since younger leaves
produce the most food, the older ones drop off to conserve what little
energy the plant has. If the plant seems to be getting enough sun for its
variety (other of the same plants have been doing well under similar
light), it may be the soil. Too wet or not enough fertilizer can be the
culprits. Try repotting, or amending soil by adding a little coarse sand
to improve drainage and compost for nutrients.

2. Natural Aging; this can make a plant look leggy; try pinching back to
promote a more busy plant.

3. Younger leaves are yellow and look weak; usually not enogugh
fertilizer. Don't overfeed to compensate or plant might go into shock.

4. Yellow, then brown, crispy and drop off; try misting and watering more
regulary when soil is dry to touch.

5. Yellow spots; usually caused by too much sunlight or pesticide damage.

Also pollution, insects, and plant viruses may be the culprit. Don't wait
for leaves to get better. Remove them to avoid having them sap valuable
energy from new growth.

Hope this helps.

Carmel Matsushita   Queens, New York  zone 6
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