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Allium Leaf Miner
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Date Posted: Sun, May 28 - 8:55 pm
- I think I might have allium leaf miner in a few of my overwintered leeks. I took pictures, video and saved a sample in a ziplock bag containing the reddish brown egg. I’m not particularly worried about the crop but wasn’t sure if I should contact you since it’s a relatively new invasive pest. It seemed like covering and exclusion measures will be my best bet going forward. Thanks!
- I'm sorry to hear your leeks have been hit by the allium leaf miner. There are a few prevention techniques to consider going forward. 1. Solarization. The garden bed can be covered with clear plastic for four weeks over the summer, being sure to bury the edges so heat is trapped. Solarization will kill allium leaf miner pupae, decrease soil pathogens, and increase beneficial microbes. 2. Rotation Planting. Refrain from planting members of the allium family in the same bed for one year or longer since the pupae will overwinter in the bed. 3. Cover crops. Consider planting members of the cabbage family in the bed prior to planting allium. The sulfur produced by the cabbage crops will transfer to your allium making them more pungent and less desirable to the fly. Another benefit is that brassica plants decrease the amount of nitrogen available in the soil which is beneficial as flies are more drawn to high levels of nitrogen in plants. 4. As you have already mentioned, row covers. Cover the plants at planting time in the fall (September/October) and remove for the winter. Plants will need to be covered again for the spring (March/April) before overwintering pupae emerge. Since the allium leaf miner is very small, it's important to be sure the edges of your covers are pinned down well or buried. Thank you for reporting this finding so the spread of allium leaf miner can be monitored and best of luck with your future plants!
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Rhododendrons
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Date Posted: Wed, Apr 26 - 3:24 pm
- I have several rhododendron bushes in my front yard. They usually bloom once a year. I would like them to bloom more often. I don’t understand why one of the bushes leaves turned completely brown and died. Will this bush come back? Should I pull it up? What can I do?
- Hello there, Rhododendrons bloom once a year, in late winter into spring depending on variety. You could add other varieties with different bloom times to extend the show. You could also add some azaleas (which are in the same family). Some of those do bloom twice a year. The variety Encore comes to mind. As for the browning of the leaves and leaf drop, a number of issues could be causing that. Poor drainage, leaf burn from too much sun, winter burn, nutrient deficiency. It's difficult to diagnose in this manner. But you can try this practice - if you give the plant plenty of time to begin spring growth—waiting until late spring—you can then scratch the bark on dead-looking branches with your fingernail. If there is green wood underneath, the branch is still alive. Leave it be and it may very well leaf out. If it's brown underneath, the branch is dead and you can prune it off. Also, you can visit one of the Master Gardeners that man the desk at your local library. Call the library to see when the Help Desk is in session. Any information you have about the plants-photos, samples, will be helpful. But sometimes you need to assess the planting environment to narrow down the problem. You can also get a soil testing kit and the results will help you improve the nutrients and condition of your soil to ensure future plant health.
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Camellia Pruning
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Date Posted: Thu, Mar 02 - 4:57 pm
- We have a camelia bush in our front yard that is as old as our house. It’s probably 25 ft wide at its widest. It’s in desperate need of a trim, but I have no idea how to do that! I don’t want To harm the bush at all, but I know it needs to be trimmed. I can provide pictures if helpful!
- Hello there, so you have a very happy camellia on your hands. I'm going to guess it's a japanese camellia, flowering from mid-winter to early spring. The other popular variety is camellia sasanqua, which flowers in late summer, fall or early winter (depending on selection) and is generally smaller and looser than the japanese varieties. Either way you want to wait until after the plant blooms to prune (otherwise you'll miss the bloom period). Of course, if that isn't you uppermost concern and you just want to get it under control, then anytime can work. I'm attaching an article from Southern Living magazine that describes a pruning method I think will work for you. The method basically treats the shrub as a tree which would decrease your time and effort of trying to prune such a large plant back to shrub proportions. Here is the article. The last paragraph is the key. https://www.southernliving.com/garden/shrubs/when-to-prune-camellias As always use sharp clean pruners and pruning saws so disease isn't transferred to the new cuts you'll be making. Good luck and happy gardening!
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Native shrubs
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Date Posted: Mon, Jan 09 - 5:37 pm
- Hello, I am looking for a shrub to plant as a privacy screen. I will be planting along the south fence line of my property; however, the fence line itself is already planted with Chinese privet trees (ugh) that can't be removed, so anything I plant may get some shade from these trees. I'm looking for something 5-6 feet tall that will provide a sight barrier without getting too bushy (I don't want it to intrude too far into my yard). Native and/or pollinator-friendly would be a big plus! Any thoughts?
- Hello there, too bad about the privet but your planting will help to bring some pollinators and wildlife into your garden. The first shrub that comes to mind is inkberry (Ilex glabra). There are many varieties of this plant out there with different mature heights. So when shopping be very careful to read the tag and ask questions about the ultimate height and width of the plant you are choosing. The plant is evergreen and has small white flowers (not terribly noticeable) in spring that develop into small dark blue to black berries. Other native choices are mountain laurel (Kalmia latifolia) and evergreen bayberry (Morella caroliniensis). Mountain laurel can grow to 12 feet or more but can also be pruned to control height and create a bushier shrub. It has beautiful blooms in spring and is evergreen. It does like some shade so maybe the privet will help with that. It does not like clay soil. Bayberry is also evergreen and can mature around 7-10 feet. It's not too particular about soils and can take shade. It has small flowers that develop into those waxy gray blue berries most people are familiar with. All these choices are native and will attract pollinators and wildlife. Best of luck with your project!
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Starting seedlings
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Date Posted: Fri, Jan 06 - 9:22 pm
- I’m having trouble understanding when I should start planting certain plants. Also, if I have to do it inside or not. I wanted to plant native wildflowers all around my yard. This is my first time doing it and I’m unsure if I should just get a raised bed or use my ground. Where can I go to get help and is there a basic planting calendar for starting?
- Hello there, The process of starting plants from seed can seem daunting. Different plants have different requirements. Your best source of information is on the seed packet. It should state whether the seed needs warmth to germinate (which would indicate that you should probably start those plants indoors, with sufficient lighting, but note that some plants don't need light to germinate but will need the lighting after germination). You'll need to know how long a seed usually takes to germinate (that will be on the seed packet). You'll need to know when it's safe (temperature/weather) to take any indoor-grown plants outside. Generally growing from seed takes labeling and record keeping. I used to grow plants that needed an indoor headstart in my basement under grow lights that could be adjusted to accommodate the increasing height of plants. It works well if you have the space. Having a check list of plant name, days to germination, date to set outside, etc. is incredibly helpful. Having the seeds labeled in their growing medium is also important. There is an alternative method that some people use called winter sowing. Which is basically making a mini greenhouse out of a container. You can use various containers (I find the large plastic bins that contained greens from the grocery store very useful but you can also use gallon jugs w/tops cut off or similar). My personal experience with winter sowing involved chard, spinach, lettuce-plants that like the cool weather. But I'm sure it will work for flowering plants as well. The beauty of winter sowing is that the light needed is easily provided by mother nature. If you have newly ripened seed, that could go straight into the ground but most people are working with seeds that have been harvested and stored and are thinking about planting in spring. Hence, things get a bit more complicated. You'll want to work backwards from the last frost date to figure out when to plant your seeds. You may be planting different seeds at different times. Richmond is between zone 7a and 7b, so April 15th seems like a reasonable last frost date (though it's possible we could have one a bit later). Keep your eye on the weather. There's lots of information online such as plant record keeping templates you can print out for your records and info about the process of winter sowing. You'll probably wind up doing a combination of indoor starts and winter sowing. Just remember, those plant packets are your best resource! Good growing !!
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Peonies
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Date Posted: Mon, Dec 05 - 4:49 pm
- I planted two peony bushes late spring and they looked good until now. They appear to be sickly. What should I do? Are they blighted and must be destroyed? Thx
- Hello there, What you are seeing is perfectly natural. Peonies are herbaceous perennials, meaning they die back every year in fall, re-grow in spring and produce those gorgeous blooms. So simply cut the stems back and rake up any debris around the plants and they will bloom for you once again in spring. They are one of the longest lasting perennials you can plant and pretty much carefree once their soil preference is met (fertile. humusy soil). Please do not destroy them. They will reward you with blooms for years to come. Enjoy!
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Powdery mildew?
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Date Posted: Fri, Oct 07 - 7:05 pm
- Hi. We have a white film on the leaves of two poppy plants we transplanted over a year ago. Cosmetically, it's not pretty. But don't know if it's harmful. It is only in the last 6 months that the film has appeared. They're under a dogwood tree, didn't know if that affected them. Can you tell me if this is harmful, and if it will impact the blooms? I don't see any buds so I fear this is a problem for the plants.
- Hello there, It sounds to me that you are dealing with powdery mildew. It's a very common fungal problem, heat and humidity aid its progress. It generally doesn't kill the plant, the plant just doesn't look it's best. I don't know which type of poppy you have but I'm guessing it's one of the oriental poppies (papaver orientale), that bloom in spring? You may want to consider transplanting the poppies to a spot in full sun with good air circulation. Cut back the foliage at the end of the season and dispose of it in the trash (not the compost pile). You don't want to be harboring the spores over winter. With some more sun and air, I think you will enjoy those poppies more. Good luck!
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Pollinator gardens
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Date Posted: Wed, Sep 28 - 11:26 pm
- Thank you for your quick response! The after school program supports 24 students (12 second graders, 12 third graders). We will be researching and designing the gardens from October until December. The program runs until the end of the year, so we can build it next spring or late fall - whichever best meets your schedule. The principal is allowing us to build it in the area where a previous garden was built a few years ago. I believe it will be roughly 5' by 5'. Do you have anyone that might be interested in discussing gardening or butterflies with the students? The presentation can be virtual or in person. Thank you again for your assistance.
- Thank you, this is very helpful. It sounds like a great program! I'll be passing this along to others and will post it as a volunteer opportunity for those to help build and instruct. Please send me all your contact information to this address--jrreilly2323@gmail.com and we can discuss more specifics. We look forward to working with you!
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Native plants
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Date Posted: Thu, Sep 15 - 9:44 pm
- I have an east-facing front yard in the Museum District and have approximately 12X 6 feet of space to work with. We recently got a retaining wall put in, and so it is a fresh canvas. The space gets full sun at least half the day. I love native plants, and particularly those that would remain evergreen in the winter. Any suggestions?
- Hello there, so nice to start fresh! I'm glad to hear you are interested in using native plants. I'm assuming the space is 12 feet wide and 6 feet deep. You'll probably want to start by creating some structure with shrubs. For evergreen green shrubs you could use inkberry (ilex glabra). There are many varieties of this plant, some have a loose form whiele others have a tighter globe shape and there are large and smaller sizes as well. So there's an inkberry to fit most spaces and styles. Mountain laurel is also another lovely evergreen plant with beautiful blooms in spring. Dog hobble or more commonly just Leucothoe (axillaris) is another nice evergreen. There is a variegated variety if you want to brighten up a space. You may also want to try evergreen bayberry (morella caroliniensis). In addition to these evergreens, there is virginia sweetspire (itea virginica) which has a nice drape to its shape, panicles of white flowers and beautiful fall color. Another good shrub is pepperbush (clethra alnifolia) with white to pink flowers (depending on variety) which is wonderfully fragrant. There is a smaller-sized variety that would fit in most gardens. Many of the plants in the blueberry family - early lowbush and deerberry (vaccinum pallida+vaccinum stamineum) have gorgeous fall color and colored bare stems in winter. Their spring flowers are delicate and beautiful and their fruits add to their appeal. I know you have a small space but I wanted to give a good number of options so you can pick and choose. Once you have a plan, you can decide what you want to place where. After placing the shrubs, you can then think about adding some lovely native ferns, perennials and/or ground cover, whatever space will allow. Before deciding on plants and placement, you should have a soil test done if you haven't already. You can amend if necessary and as an annual ritual, add compost to nourish you plantings. You can get a soil test kit at your local library when the Master Gardener Help Desk is in operation. Call your local library to find out the day and time. For additional information I suggest checking out this website and using the plant guides for the Capital region and NOVA-- https://www.plantvirginianatives.org/plant-rva-natives. Best of luck with the new garden!
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Pests and diseases
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Date Posted: Mon, Apr 11 - 6:11 pm
- Hi there, We just moved into our home last fall and I’m just getting into gardening. I have a few issues I’d love some help with, namely, treating leaf diseases on a young azalea with freeze damaged buds, a large overgrown camellia with what I think is tea scale and flower blight, and leaf spots on mophead hydrangeas. There’s so much information out there but would love help identifying these issues correctly and providing timely care while we’re still in early Spring. Thank you! Emily
- Hello Emily, Good to hear you've inherited a nice garden. There is always a learning curve with a new garden. I think the best way to answer your questions is by using the Plant Disease Clinic. The Richmond VCE office is closed until a new agent is in place. In the meantime, the Chesterfield office is generously offering this service. The clinic does charge a fee of $35 for samples. I'm including a link to their office so you contact them directly for instructions on the process-- vce@chesterfield.gov Best of luck and happy gardening!