The long summer days are beginning to wane, the mercury is starting its slow march down the thermometer, and your landscape displays all the signs of winter. It’s the time of year that many gardeners dread. Fear not, my fellow parishioners of the soil. I’m here to tell you that there is hope for your landscape. With a little planning, your home can remain beautiful as there are blooms aplenty even into the autumn months here in Florida.
Deciduous Trees
Established deciduous landscape plants begin their annual cycle by sloughing off their leaves, but this doesn’t mean they have no value. After months of standing boldly in your yard, many begin to lose their chlorophyll and turn eye-catching hues of orange and purple. Trees such as bald cypress (Taxodium distichum) create a fantastic fall display as they march into winter slumber. Maples (Acer spp.) will similarly provide a beautiful show once the cold weather hits. Plant these trees in your landscape while observing the “right plant, right place” philosophy and you will provide a low-maintenance pallet of annual colors for decades.
Bald Cypress beginning to display fall color. UF/IFAS photo: J. Criss
Perpetual Perennials
Next, perennial plants are the lynchpin in many landscapes, filling in the space between your trees and inground annuals. Choosing those with bright, warm colors will make your yard stand out against your neighbors. Remember, when planting, some plants will not survive the first frost. One plant prone to this style of dieback is fire spike (Odontonema strictum). Here, you will find bright red blooms underpinned by large, striking green leaves. Don’t be dissuaded by the frost-tender nature of this plant, it is an excellent specimen and supports pollinators later into the season. Salvia (Salvia spp.) is another superb specimen for some color later in the season. This again will die off upon the first frost but, until then, will provide bright flowers with grey-green foliage that is striking in any garden. For those seeking an evergreen autumn bloomer, look no further than the leopard plant (Farfugium japonicum). This sometimes overlooked and shade-loving member of the aster family provides yellow flowers through the fall and unique round leaves throughout the rest of the year.
Fire Spike in bloom. UF/IFAS photo: J. CrissLeopard plant in bloom. UF/IFAS photo: J. Criss
Annuals for Brilliant Color
Finally, let us peruse flowering annuals. The advantage here is the vibrant colors they bring, but they are short lived and will need to be rotated out in a few months. Sweet alyssum (Lobularia maritima) is a prime example of a versatile plant fitting this bill. They have a spreading habit, making them excellent as a cold weather ground cover or a beautiful trailing potted plant hung on your porch. If sprawling isn’t your cup of tea, investigate calendula (Calendula officinalis) for a splash of yellow in an upright ray-style flower. Remember that these cold weather annuals will not tolerate heat or humidity, so plant them in the fall when things cool off. They will do well in the ground directly or with a pot-in-pot system. The latter will allow easy switches should the plants begin to falter. If planted directly in-ground, prepare your site accordingly. Soil testing will dictate fertilization needs and adding organic matter will ensure adequate water retention.
Yellow Calendula bloom
Photo by Rob Duval. (CC-BY-SA 4.0)
Gardening in Florida is always a tough row to hoe. We are fortunate in that we can provide color in our landscapes throughout the year, but to do so one must understand our dynamic environment. Florida will throw you some curveballs, but with a little planning and some understanding you’ll be well on your way to thriving gardens. For more information, see this Ask IFAS document for trees, this ASK IFAS for perennials, or this ASK IFAS for annuals. As always, please contact your local extension agent for additional information on this and any topic regarding your gardens and more.
It has been dry as a bone lately, and your landscape is beginning to reflect that fact. Before you call it the dreaded “D” word you should understand that these dry periods are part of our yearly weather cycle. This year, we are drier than usual which means we are indeed in a drought. This can be alarming as you’ve doubtless spent tons of time and money on your landscape and want it to thrive. Irrigating as much as possible may seem attractive but is not necessarily the best strategy. Let’s first look into a few questions. What happens to your plants when Mother Nature turns off the waterworks? What can be done to prevent the mass die-off of our landscape plants?
Drought Response
Before we delve too deeply into the subject, it’s worth taking a few lines to discuss what happens to plants in periods of drought. Many will close the tiny pinpricks in their leaves known as stomata to prevent water loss. This is known as a drought avoidance strategy, and while seemingly foolproof also prevents moisture absorption while shutting down photosynthesis. If this condition persists, the plant will begin to lose the macronutrient carbon and sugars. When a lack of water becomes long term, the plant will perish as it lacks resources.
UF/IFAS photo: J. Criss
Other plants utilize a drought tolerance strategy. Unlike the avoidance strategy, these plants leave their stomata wide open despite the lack of moisture in the soil. The advantage here is that photosynthesis never stops. They’re banking on a return of water before they perish from dehydration. Most of your landscape plants utilize the first of these strategies. Your gardening habits and strategies are crucial to keep your plants thriving even in our extreme heat.
Gardening Practices
The practices you implement in your gardens are what we refer to in this business as “cultural practices.” You may have heard of these at lectures on Integrated pest management, but they are just as applicable in landscape management.
Irrigation is easily the most crucial of these practices as improper watering is the number one killer of plants. Deeper watering delivered less frequently encourages deeper rooting and higher drought tolerance. Irrigation should occur early in the morning just before sunrise to prevent evaporation and mitigate fungal issues as plant water use begins at sun rise. Frequency and volume are the next critical factors in watering. Turf grasses need 1/2 to 3/4 inch of water, but only when they present the three signs of wilt including folded blades, a bluish-grey hue, and lingering footprints. Bedding and landscape plants are a little trickier as they don’t have standardized signs of wilt. You’ll need to pay close attention for loss of vigor in the leaves which are likely to be subtle. When these signs present, apply enough water to reach their root zone. A great way to extend the time between irrigation events is to amend soils with organic matter and to utilize mulch. These retain moisture keeping your plants less thirsty.
UF/IFAS Photo T. Jones.
Fertilization can be another far more detrimental to plant growth than you think. While it’s true that your plants need nutrition for vigorous growth, only those deficient in the soil are limiting factors. This is simply not possible to create a fertilization strategy without soil testing. Your extension office can facilitate testing, which should occur at a minimum every three years. Balance these deficiencies with your plant’s needs to create a healthy landscape.
Pruning is the final practice to look at for healthy landscapes. Turfgrasses need to be cut at a height conducive to their growth. This varies for each grass type, so make sure you know yours. Landscape plants may also need species specific pruning practices such as deadheading to maintain healthy growth.
To Sum Up
The key takeaway from this article is that stress free plants are more capable of tolerating less than ideal growth environments. Familiarize yourself with the needs of your plants and provide them with what they need to thrive. Very often this means less intensive maintenance practices. For more information, see this Ask IFAS document, or contact your local extension agent for additional information on this and any topic regarding your gardens and more.
The year is starting to close out and fall is the perfect season to transform a small part of your parcel into wildflowers. It is a concept thrown around quite a bit, and there are numerous reasons to do so. Not only will you provide great resources to our native and introduced pollinator species, but you’ll also create a habitat for predatory and parasitoid insects. These are nature’s hunters who specialize in keeping the herbivorous pest insect species in your landscape in check and can reduce the amount you spend on insecticides throughout the year. There are some tricks to planting and establishing these plantings, but with a little planning, you’ll be well on your way.
Choose your flowers
The first order of business is to select the plants you’d like to grow. The goal should be to have multiple plants in flower simultaneously and spread out through the year as best you can. Use those long-lasting flowers as a mainstay in your garden. These include black-eyed Susan (Rudbeckia hirta), blanket flower (Gaillardia pulchella), and coneflower (Echinacea spp.). Their extended blooms bring color to your landscape for much of, but not the entire year. Winter can be particularly tricky for flowering plants. The cold and shorter days limit your choices. Fortunately, Florida means the “land of flowers” for a reason. Some of our mid-winter bloomers include blue phlox (Phlox divaricate) and lyreleaf sage (Salvia lyrata).
UF/IFAS photo: J. Criss
Pick the Site
Once you’ve thought about the plants you’d like to see in your wildflower bed, you must pick the site. Full sun in an area that is not regularly disturbed and is well-drained is best for wildflowers. Full sun allows the flowers to develop more efficiently and thus have better resources available for pollinators. That much light will also enable the bees to begin their work earlier in the day. You’ll need to disturb the soil initially, but it’s a practice you’ll want to avoid in subsequent years. Many pollinators, particularly bees, are solitary and nest in the ground. Leaving the ground intact provides better nesting and another level of support.
Once you’ve selected where you would like your planting, the site must be prepared for planting. Essentially, this involves the removal of grasses and other plant material, which will suck up the resources better suited for your wildflowers. There are numerous ways to accomplish this task, and how you choose to will depend on your philosophy on gardening.
UF/IFAS photo: J. Criss
Time to Plant
Now that you’re down to bare soil, it’s time to plant. A no-till drill is a wonderful tool for this with no soil disturbance. They are also quite expensive and require a tractor to pull them, so they’re impractical for the average homeowner. The best option is to broadcast seeds with a drop or handheld spreader in the home landscape. Before loading the equipment, make sure to mix larger and smaller seeds to help with even distribution. If you only have light seed, mix in a bulking agent such as sand to ensure even distribution. Run over the area with a yard roller to push the seed into your soil. Planting in the fall should ensure there is enough rain to aid seed germination, but supplemental irrigation may be needed early in the growth cycle.
Wildflower gardens make a wonderful addition to your landscape and once established an easy way to add year-round color. For more information, see this Ask IFAS document, or contact your local extension agent for additional information on this and any topic regarding your gardens and more.
Fertilization is a subject that throws many a gardener for a loop. It can be confusing, and we in the professional horticulture world understand. This topic will almost always be approached from the prospective of nitrogen. So why does nitrogen get so much attention? What is its role in plant growth? Nitrogen is the primary driver of protein synthesis, plant metabolism, energy creation, and is the structural component in chlorophyll. These are all extremely important functions leaving little doubt as to why it’s so critical. Your plants use this resource abundantly for healthy growth. The reason it gets so much attention is owing to its frangibility in the soil. Nitrogen goes through changes once applied to soils and is readily lost to the environment. For this reason, nitrogen application needs to be timed appropriately, and your cultural practices need to be such that encourage plant uptake over losses to the environment. Fear not my friends, this article will bolster your insight into the wonderful world of nitrogen, and have your plants growing strong and healthy.
The What and Why of Nitrogen
Nitrogen is one of three macronutrients identified in every fertilizer bag as the first of three numbers. This standardized NPK labeling refers to the amount of this nutrient in the bag by percentage of total weight. Application rates should be based on this number, and how much nitrogen you’ll need to cover a specified area. which number you use is based on the equipment you have to apply more so than the plant requirements.
UF/IFAS Photo: Dan Culbert
Nitrogen can be natural or man made. Natural sources come in the form of composts, manures, and through atmospheric deposition. The later of these sources means rain, which washes nitrogen out of the atmosphere and into your soils. Man made sources conversely come in bags and are the result of a combustion process developed by Fritz Haber, and Carl Bosch circa 1910. Either way, nitrogen will be in the form of ammonia, nitrate, ammonium, or urea. Knowing this is important as it will dictate application methodologies. For instance, urea applied to the surface will escape into the atmosphere if not incorporated into your garden.
UF/IFAS photo: T.W. Shaddox
Nitrogen type will also affect soil pH. This is especially important with ammonia-based fertilizers as residual acidity from them may lower pH. Applying the correct type will mitigate large unwanted changes in soil. Why are we concerned with soil pH? It speaks to nutrient availability and, thus how well your plants grow. It can be overwhelming, but with soil testing and a call to your extension office, it’s easy to identify the appropriate fertilizers for your application.
Reactions in Soils
Soil is often considered inert, holding plants in place while providing a pantry full of the nutrients they crave. Nothing is further from the truth. Soil is a living entity with its own physical and chemical properties. The addition of anything, including irrigation, affects these properties.
Nitrogen takes two forms in your soil aside from nitrogen source. Inorganic nitrogen is converted from soil organic matter in a process known as mineralization or added from bagged fertilizers and is available for plant uptake. Organic nitrogen is unavailable for plant uptake and will be present in the natural forms listed in the previous section. Both are susceptible to the nitrogen cycle and may be lost to the environment. This happens as water passes through soil (leaching), erosion, runoff, or is lost to the atmosphere through volatilization and may have negative effects on surrounding water bodies.
UF/IFAS Photo
To mitigate these risks through responsible fertilizer application, irrigation management, and landscape design. Apply fertilizers when plant uptake is favorable, and only to the level required by your plants. This will be during heavy vegetative growth periods such as initial installation. Irrigate as dictated by your plant life vs on a timer. Watering is a vital practice, but often overdone. Keep water levels enough to avoid plant stress but not excessive. Doing so reduces leaching potential and will keep your plants healthier. Finally, design your landscape with Florida Friendly Landscaping principles. Integrate diverse plant life, including turfgrasses and landscaped beds. The goal here is to allow enough plant life to absorb excess storm water, and support local pollinator populations.
Nitrogen is a critical piece of your fertilizer routine. It’s important to understand how it reacts with both your plants and your soils. A little knowledge can go a long way to keeping your plants healthy while mitigating risks from over fertilization. For more information, see this Ask IFAS document, or contact your local extension agent for additional information on this and any topic regarding your gardens and more.
Landscapes can be a tricky topic. Doubtless, you’ve heard people debate the ecological benefits of a turfgrass lawn. An internet search will have your head swimming in opinion pieces detailing the benefits of keeping and removing your turfgrasses. Some outline the aesthetic virtues while others speak to pollinator support from native flowering plants. It can be overwhelming and there are a lot of factors to weigh in these decisions. Luckily this is a situation in which following the Florida Friendly Landscaping program means you may have your cake and eat it too.
Florida Friendly Landscaping
Florida Friendly Landscaping or FFL is a series of nine principles designed to maximize the ecological services of your landscaping while minimizing inputs. It all begins with selecting the correct plants and placing them in the proper place. Once in place, proper maintenance is covered by the following three principles which involve proper watering, fertilization, and mulching. Since we planted good larval and nectar plants our landscape attracts wildlife, which is the next principle. In this process, you’re likely to also attract insects you don’t want. Managing these responsibly is our next principle. The final three principles involve utilizing plant waste from your landscape, managing stormwater, and protecting waterways. Where a good deal of these involves proper maintenance and selection of plants, the purpose of this article is to highlight the two main ecological services outlined in these principles.
UF/IFAS Photo: Tyler Jones.
Support Wildlife
The first of these is attracting wildlife which for a wide swath of homeowners will focus on supporting pollinators. Pollination is critical for non-vegetative reproduction in plants. It’s the reason they produce vegetables or flowers. Many creatures aside from the well known ones perform pollination including bats, birds, flies, and beetles. Look into the needs of the pollinators you wish to attract and understand how these creatures eat, breed, and nest. These pieces of knowledge will help you decide on landscape plants. Create habitat by planting smaller areas with native and noninvasive plants which meet the needs of the pollinators you wish to attract. These areas need not replace all the turfgrass areas, and in fact, it’s better if they don’t.
Photo: Joshua Criss
Turfgrasses are Crucial in Your Landscape
Turfgrasses are ecological workhorses. They cool your environment, build soil, prevent erosion, aid water infiltration, and are arguably the best bio-filter in the plant world. Properly maintaining your grass is much easier than you may think. They need 1/2 to 3/4 inch of water per irrigation event, and generally only 1-2 pounds of nitrogen per 1000 square feet per year (Bermudagrass may need up to 5 pounds). Even this may be less pending soil testing. Keeping these grasses stress free through proper maintenance allows them to grow lush with little input.
Their benefit as a bio-filter comes into play with regard to storm water. This runoff is a seldom thought of as a pollution source. On top of moving debris and latent chemicals into local waterways, it washes dissolved organic nitrogen through the soil. All of this eventually finds its way into local waterways. Grass areas of your landscape slow free flowing storm water and filter pollutants preventing excess nutrient and pollution loads in the watershed.
Photo: Joshua Criss
Following the principles of a Florida Friendly Landscape can boost the aesthetics of your property and provide an ecological boon. Mix flowering and turfgrass sections of your landscape to meet these goals. For more information on these principles, see this Ask IFAS document, or contact your local extension agent for additional information on this and any topic regarding your gardens and more.
