The 10 Facebook questions of the week


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Every week our social media team reaches a few hundred questions about our favorite hobby: the garden. Most of them are quite easy to answer for the editorial team of MEIN, but some also require some research effort to be able to provide the right answer. At the beginning of each new week we put together for you our ten Facebook questions of the past week. The themes are mixed - from the lawn over the vegetable patch to the balcony box.

Fruits of the mandarin tree

If lemon, orange, or tangerine trees get yellow leaves, nutrient deficiency can be the cause

Facebook: The top questions of the calendar week 39

1. My tangerine tree has set fruit and has also got fertilizer. Now many leaves turn yellow and fall off. What could be the cause?

If lemon, orange, or tangerine trees get yellow leaves, they will suffer from nutritional deficiencies. In addition to nitrogen, you need abundant trace elements such as magnesium or iron. Iron deficiency occurs when the reserves in the soil are consumed or the soil is too calcareous and chemically holds the iron contained. This can happen, for example, when you pour kalkhaltigem tap water. Iron fertilizers help against acute iron deficiency, which are either added to the ground with the irrigation water or spread on the leaves with the spray bottle. Preventive special citrus fertilizers are recommended, which are geared to the high nutritional requirements and the low pH requirements of citrus plants.

2. Our hydrangeas all get a kind of mold on the leaves. What could it be?

Your hydrangea probably suffers from gray mold, which is a fungal disease that often occurs like powdery mildew and leaf blotch on hydrangea. So that the fungus does not spread further, you have to cut off the affected parts of the plant. As a precaution, you can give the plant next year a plant tonic and a fertilizer with a balanced nutrient ratio. High nitrogen fertilization makes the plant tissue softer and more susceptible.

red climbing roses

Too much rainwater can cause root damage in climbing roses

3. In my garden I have several climbing roses, some old, but also some that I planted last year. In the spring, all are nicely expelled, but then the leaves turned brown and fell off. Now, over the summer, the roses have the most beautiful flowers, but almost no leaves. What can you do there?

If no animal pests and no fungus are responsible for it - in contrast, "the most beautiful flowers" - we tap on a root damage caused by too much rainwater in early summer. Cut down all roses vigorously next spring for forsythia blossom and initially fertilize only slightly so that the plant has a reason to make many new roots, and not have to supply too much new leaf mass.

4. When may I cut peonies and what should I pay attention to?

Perennial peonies should be cut back a hand's breadth above the ground in the fall, the shoots of the bush peony are lignified and generally do not require a cut.

Nesting boxes for birds

After the breeding season, the nest boxes should be cleaned

5. I have never cleaned my nesting boxes and there are birds in there every year. In winter, the old nesting material warms or I see that wrong?

The NABU also recommends cleaning the nesting boxes at the end of the breeding season, so that ticks, mites and fleas do not torment the young birds of the next brood. Small mammals, such as the dormouse, usually look for themselves from frost-free wintering quarters.

6. Last year, we planted red and yellow raspberries from foothills. The varieties are unknown. Fruits were already in the summer's turn, which we have all reaped. We have not cut them yet. Recently, individual rods have flourished again and formed delicious fruits. Now I do not even know if it's summer or fall varieties. How are the respective raspberries cut?

Summer and autumn raspberries can be distinguished by the ripening time of the fruits: summer raspberries ripen from June to the end of August and autumn raspberries ripen from the end of July to October. Several raspberries, such as 'Autumn Bliss', produce fruit in midsummer on the two-year-old branches. In late summer, the young shoots formed in the same year are already producing fruit. The berries on the biennial branches, however, remain small and do not taste so good. For this reason, cut all removed rods to just above the ground before the new shoot. The new shoots spring from mid-August to frost and the berries taste better.

Tulips in the pot

Tulips need the cold to drive them out in the spring

7. I would be interested in how I bring tulip bulbs, which I planted in bowls and pots, on the terrace over the winter?

You can spend the winter outside on the terrace with tulip bulbs in a pot. They need the cold stimulus to drive them out in the spring. Best to put on the wall, in prolonged periods of frost you should protect the pot with a little straw and wrap with jute or fleece. In frost-free phases, pour occasionally if the pots are under a roof projection. Also important are drain holes in the bottom of the pot as well as a proper drainage layer of expanded clay or gravel in the bottom of the pot, so that the onions do not begin to rot with prolonged rainfall.

8. Quite stupidly asked: Do not tulips multiply by themselves? Or do you have to plant new ones every year?

That depends on the tulip type. Under optimal conditions, some bulbous flowers, such as the wild tulips, grow vigorously in the garden through bulbs - this is called cheating. Among the hybrid varieties are Darwin tulips, lily-flowered tulips and Viridiflora tulips as particularly enduring. There are some tulip species that are rather short-lived and disappear after a few years from the bed. Depending on the color scheme of the beds, one or the other hobby gardener enjoys from time to time upgrading their beds with new colors and shapes.

pink oleander blossom

Brown leaf margins on the oleander could be sunburn or over-fertilizing damage

9. Why does our oleander have brown edges on some leaves? Sunburn?

In Oleander, if the leaf margins turn brown and die off, sunburn damage may occur in spring after clearing, but it may also be over-fertilizing damage. Remove brown leaves, these are usually overgrown quickly by fresh, healthy leaves. When clearing out, pay attention to the sunscreen and if possible over-fertilizing, flush the bucket earth with plenty of water, removing the coaster.

10. We are redesigning our garden a bit. Can I plant new grasses now?

Ornamental grasses are often offered in the fall, but for example, the millet is better planted in the spring. Incidentally, this applies to all so-called "Warm Season Grasses", which include Miscanthus and Pennisetum. Unlike these two, the Kentish millet is less sensitive to frost and comes in early fall planting mostly well through the winter. "Warm Season Grasses" start late in the garden year. They like it sunny, hot and only really get going from a floor temperature of 12 to 15 degrees, so from May / June. Their rooting already ends in August, the soil and climate requirements are similar to those of corn. Local grasses, such as fescue (Festuca), head grass (Sesleria) and sedge (Carex), are counted against the "cool season grasses". They are also rooted in cooler temperatures and can therefore be well divided and transplanted in autumn.

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