Questions for August 2007

Question:

I bought a lavender tree lavandula dentata I planted about 6weeks ago it does say its hare had only the odd night of frost but don t expose to prolonged frost we have had only the odd night of frost since I bought it I have noticed today there are one or two brown spikes on it and the rest seem to be drooping I have given it a feed of miracle grow rose and shrub food I am been unduly concerned will it perk up when the weather gets warmer and is there any thing I can specifically do to help it.

Answer:

Unfortunately Lavandula dentate (French Lavender) is not hardy in the UK so should be kept indoors during the winter. You could try bringing it in now, keeping it warm for the next few weeks to see if it perks up. Don’t cut off the brown spikes just yet. If you still have some green growth by the end of April then prune it back before placing outdoors for the summer. Be careful not to prune into any old or brown woody parts of the plant as it will never re-grow from these areas.

Question:

I would like to know if I could put my magnolia in a container as I am moving house and the garden is all slabs, it is around 2 to 3 years old and around 4 foot.

Answer:

My mum has successfully grown her magnolia in a pot for years and it always looks good. I assume it is in the ground at the moment so you will have to carefully lift it ensuring you don’t damage the roots. Make sure it doesn’t dry out before placing it in as large a pot as possible. Put lots of crocks in the bottom to help drainage and add a slow release fertilizer to the soil around the plant. Each year top off the plant with new compost and / or manure to keep the soil well fed. You may find it goes into shock this year but it should be OK by next year’s flowering season. You will find that the plant won’t grow as big as it would if it was in the ground and it may not live as long either.

Question:

I currently live in West Sussex and do hope that you can give me some advice on the Meyers lemon tree that I purchased last year. You see I am new to the way of gardening here in England, as I spent most of my gardening life in the tropical area of South Africa where it never gets really cold. As I have already mentioned I purchased a lemon tree, which I put into a huge pot on my patio, but now I see that during the course of winter it has lost all its leaves and a lot of the tips of the branches have gone brown. I did not place it indoors, as I do not have the strength to be lugging it around – nor did I cover it with anything. My question is do I throw the tree away or do you think it will pick up again in spring.

Answer:

Unfortunately citrus plants will not survive outside during an English winter. However, having said that, if you have not had a hard frost and it’s in a sheltered position then you may get away with it. I wouldn’t give up on it just yet. Buy some horticultural fleece (available from garden centres or the larger DIY stores, cover it for the rest of the winter and make sure it doesn’t get too wet. If it’s survived you should see new leaves appearing when the weather warms up during April/May.

Question:

Can you please tell me any plants besides Aubrietia that you can plant in the top of a walled raised bed to hang over or to plant vertically in the wall?

Answer:

Please find below some suggestions. Most of these are alpines and do require a well drained soil. Cerastium (Snow-in-summer) – colour: white Iberis (Candytuft) – colour: white Linaria (Toadflax) – colour: various – there is an upright version of this too Saponaria (Soapwort) – colour: pink. You could also consider planting a nice coloured, small leaved ivy to trail down and plant some low growing alpines, such as Thrift to add some height. If you don’t mind a bit of work you could consider planting trailing geraniums or other colourful annuals each year.

Question:

Our neighbours have just built an extension, the side wall of which overlooks our back garden. Unfortunately, a variety of bricks have been used and they haven’t been spaced out very well with the result that the wall overlooking our back garden is unsightly and also oppressive. We would like a fast growing plant which would hide the wall. The wall goes up to 310 cm in height. Please could you advise us as to what would be the best plant to hide this wall and which would grow quickly?

Answer:

My ideal would be ivy. There are lots of different varieties giving you a wide selection of leaf sizes and colours which are evergreen. Once established it is extremely fast growing and also has the benefit of being able to climb without support and will grow in any situation. The other is the Montana range of Clematis which again is very fast growing and has the extra benefit of fragrant flowers in the spring. However you will need to erect some sort of support structure such as trellis or wires before planting. A sunny site will give the best results. Which ever plant you choose make sure you don’t plant it too close to the wall as it won’t be able to get as much water as it needs. If you go to my Plant your Garden page http://gardeningregister.co.uk/NonProductPages/Articles/planting.htm.  You will see an advert from Crocus. If you click the Climbers box you will be able to enter some information about the location and features required and receive a number of suggestions back.

Question:

I’ve got a question about holly trees that you might be able to answer for me…! As you know – you need male and female holly for the female plant to produce berries, but do the male and female plant need to be the same variety?? I have a silver queen (male) and a golden king (female) – will I get berries from this??

Answer:

I have double checked and you only need to have one male holly, of any variety, to pollinate several female plants of any variety. Therefore the two you have will do fine; the female plant will produce the berries, not the male. If you’d like more berries you could buy another female variety.

Question:

I am the General Manager of a psychiatric unit in London. We have recently built a secure steel balcony to provide additional outdoor space to one of our first floor wards. The construction is a ‘metal cage’ with a very raw look to it and I would appreciate it if you could give me some ideas on the types of plants we would use to brighten up the area. The balcony is south facing and I would preferably like ones that are easy to manage and stay evergreen so there is colour all year round. Have you any suggestions. The main problem is that for safety reasons we can not use climbing plants as patients could use these to climb up and fall, we can not use plants that have poisonous leaves or berries as patients could eat these and we are unable to use plants that have sharp edges as patients may use these to self harm or ones that attract bees in case of allergic reaction to possible bee stings. In addition, we would require the plants to be in pots that are too heavy for a patient to lift in case they throw them. As you can see from a non-gardeners point of view I am struggling to find the appropriate plants and your assistance and advice would be very welcome.

Answer:

I’ve come up with some ideas and attach an outline of a plan which may be of interest. My first thought was to fit a bench across the left-hand 2.4m section. This could be attached to the balcony and would allow seating for a few people. I have also left room for quite a large table and six chairs. Your idea of galvanized containers screwed into the patio seems a good idea and I’ve found a couple of sites which may be able to provide them. http://www.foxesboxes.com/galsteelmain.html and http://shop.theurbangarden.co.uk/product_select.asp?prtID=49&d=planters. The alternative is to have a raised bed built into the corner which is also attached to the balcony as per my plan. You could have it built as one big “box” or if you had six separate boxes they could be tiered so that the outermost ones are lower than the top ones. This would provide more interest and allow for plants to cascade the corners of each “box”. As for plants. My initial thought is to use Herbs. These are usually soft and are, of course, edible. For added interest I thought a few grasses. I have found a few examples of my thoughts on Crocus.co.uk and have attached a link to their page so you can find out a little more about them. Fennel (especially Bronze which is a lovely colour) these grow to about 1.8m but not very wide so you could fit in quite a few. They are light and move with the wind giving a feeling of movement. I find it best to snip off the flowers to avoid them going to seed and ruining the look. Also, they will die down for the winter but this also means it doesn’t take over. To compliment the colour and movement of the Fennel I thought a few soft grasses would be nice. They tend to give great autumn colour and if left over the winter they provide structure and look nice when frosted. They will have to be cut back to allow the new growth through but it’s not a hard job. Here are a couple of examples. For an evergreen look I think Rosemary would be good. They can grown quite big so may need keeping in check but they are very hardy and don’t require much maintenance. They are usually a rich dark green with lavender/blue flowers during the summer. To compliment the rosemary how about Lavender. There are lots of varieties around but you need to have a good hardy one to see you through the winters. To break-up the front of the containers/bed I suggest planting a few “lesser” periwinkles. These come in white, lilac or purple in lots of different shades. The leaf colours also differ so you could find one you like. The “greater” periwinkles have bigger flowers and grow too big and fast for containers. Just tuck them into the corners of each “box” and let them hang down. They do spread so you may need to pull them up to avoid them taking over the whole container. Finally, I thought the little space near the entrance could do with something. Mint is a great herb but extremely invasive so it is ideal in its own container. There are lots available, such as pineapple mint and apple mint so again you should find some you like. They will die down for the winter but will come back each spring. Regardless of the containers you use you will have to ensure that there is adequate drainage in the bottom. Punch some holes in the base of the containers and lift them slightly off the floor. To help the drainage and keep the weight down fill the bottom of the containers with a good layer of polystyrene which you get in packaging. Use good quality compost and add some vermiculite which will also help keep the weight down but will also aid drainage. I would also add a slow release fertilizer and some water-retaining granules. You won’t be able to use hard mulch so I would top off the planting with a good layer of well-rotted manure. This will help retain moisture, keep weeds down and add goodness to the soil. Each autumn you should add another layer.

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Question:I am the General Manager of a psychiatric unit in London. We have recently built a secure steel balcony to provide additional outdoor space to one of our first floor wards. The construction is a ‘metal cage’ with a very raw look to it and I would appreciate it if you could give me some [...]

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Question:I’ve got a question about holly trees that you might be able to answer for me…! As you know – you need male and female holly for the female plant to produce berries, but do the male and female plant need to be the same variety?? I have a silver queen (male) and a golden [...]

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Question:Our neighbours have just built an extension, the side wall of which overlooks our back garden. Unfortunately, a variety of bricks have been used and they haven’t been spaced out very well with the result that the wall overlooking our back garden is unsightly and also oppressive. We would like a fast growing plant which [...]

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Question:Can you please tell me any plants besides Aubrietia that you can plant in the top of a walled raised bed to hang over or to plant vertically in the wall?Answer:Please find below some suggestions. Most of these are alpines and do require a well drained soil. Cerastium (Snow-in-summer) – colour: white Iberis (Candytuft) – [...]

Meyers Lemon Tree

Question:I currently live in West Sussex and do hope that you can give me some advice on the Meyers lemon tree that I purchased last year. You see I am new to the way of gardening here in England, as I spent most of my gardening life in the tropical area of South Africa where [...]

Magnolia

Question:I would like to know if I could put my magnolia in a container as I am moving house and the garden is all slabs, it is around 2 to 3 years old and around 4 foot.Answer:My mum has successfully grown her magnolia in a pot for years and it always looks good. I assume [...]

Lavender dentata

Question:I bought a lavender tree lavandula dentata I planted about 6weeks ago it does say its hare had only the odd night of frost but don t expose to prolonged frost we have had only the odd night of frost since I bought it I have noticed today there are one or two brown spikes [...]