Spring Hours: Thursday – Saturday Beginning March 28, 2018 from 9-5

FREE Spring Gardening Classes every Saturday at 10:00 am in April

Other Hours by Appointment. Please call 970-984-3850

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Gift Shop

Trees & Shrubs

Gardening Supplies

Annuals & Perennials

New Castle Gardens

6501 CR 214 (Peach Valley Road)
New Castle, CO 81647

We are a smoke free nursery – No Fumar. For their safety, and that of our customers, please leave your pets at home.
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Find all of our Newsletters on our Garden Talk blog.

Gardening 101

Free hands on gardening classes.
Sat 04/21/2018 at 10:00 a.m.
Free classes every Saturday at 10 a.m. through April 2018

Garden Siting, Zones, & Planting Dates 101

Know your zone, your micro-zones and what to plant when and where!ow that we have talked soils, lets talk about our climate zones and what to plant and when to plant it.

If you have a soil sample you would like me to look at, bring them in! Still time to amend your soils. This Saturday, we will move on to learning about what to plant, when to plant it and exactly where to plant it. We’ll talk about some plant basics, climate zones, micro-zones and garden siting. We’ll talk about companion planting and cold/warm season plants. We will also cover some water conservation tips

Class starts at 10 a.m. Sat 4/21/18. FREE!

Bulk Top Soil – Fantastic Price and Quality

Great Top Soil
Larger Quantities Available
Sold by the Yard
***Discounts available on larger orders***

New Materials and Plants Arriving Daily

We’ll look like this soon!
Get your special orders and requests in soon.
Annual flowers and edibles start this weekend.
Trees, shrubs, roses and perennials start next week

***We Offer Discounts for Landscapers Large Orders***
email Michelle@NewCastleGardens.com for special requests and large orders

April Garden Calendar – Colorado

Trees and Shrubs

– Plant trees, shrubs, and bare-root stock. Consider the design of your yard when choosing plants. Group plants with similar soil, light and water requirements.

– Remove mulch around roses and prune dead or damaged canes.

– Water shrubs and trees if the weather is warm and dry.

Flowers, Ground Covers, Perennials, and Ornamental Grasses

– Continue flowerbed cleanup and weed control as needed.

– Plant bare root perennials and transplant or divide summer and fall-blooming perennials like daylilies, asters, and fall anemones as they start to emerge.

– Selectively prune or pinch late blooming perennials so they are full bodied later in the season.

– Fertilize flowerbeds while plants are still dormant. A slow release 5-10-5 fertilizer is generally recommended. Apply fertilizer in bands 3-4” away from the crowns of plants and scratch fertilizer into the soil with a rake or cultivator. Keep fertilizer granules off of foliage. A soil test will determine the level of organic matter levels of your soil. This will determine if you need fertilizer and if so what type.

– “Stake” or “cage” taller perennials, like peonies and delphiniums, as they emerge. Doing this before they start to flop avoids damaging them during staking. Many nurseries and garden centers have special cages for these perennials designed specifically to maintain their natural appearance.


– Control weeds as needed.

– Core-aerate lawn.

– Check mower blades for sharpness and sharpen/replace as needed.

– Depending on growth, begin regular mowing.

– Re-seed or re-sod bare spots in the lawn.

– If cool season turf is in poor condition fertilize at 0.5 – 1 pounds. Nitrogen/1,000 sq. ft and sod or over-seed thin areas. Water as needed based on current local watering guidelines and restrictions.

– Precipitation is often at its highest in April and lawns need only about ¼” of water per week under normal circumstances. Delaying the start-up of your sprinkler system may save you money and conserve our most precious natural resource – water. Daily watering is only necessary with new seed or sod to help it establish. In all other circumstances daily watering only encourages shallow root growth and reduces the turf’s drought tolerance.

– As soon as your lawn reaches 3.5” high begin mowing; keep in mind ideal lawn height is 2.5” – 3”. To encourage lawn health and strength, try not to remove more than 1/3 of the leaf blade at each mowing. In April and May this my mean mowing every 4-5 days.


– Control weeds as needed; pulling is a great option while they are small.

– If you didn’t get this done in late March, plant cool-season vegetable crops, such as spinach, peas, carrots, lettuce, broccoli, cabbage, Swiss chard, kale, beets, carrots, radishes, radicchio, turnips and onion sets outdoors.

– If you wish to start vegetables early, warm the soil with a Wall of Water, Kozy Cone, Hot Caps or Season Extenders for one week before planting warm season vegetables.


– When you start your sprinkler system this spring consider upgrading your time clock to one with water saving features or installing a rain sensor or soil moisture sensors to help conserve water. Watch for runoff and avoid watering streets and sidewalks. Reducing your irrigation to just what the plant needs will save you money and helps prevent diseases.

– Celebrate Earth Day and Arbor Day by planting a tree or donating your time to an environmental event in your community.

April Sale

Black Gold Natural and Organic
2 cf $14.95

Black Gold Natural & Organic Potting Soil is so versatile it works for everything from hanging baskets to raised vegetable beds. This is not just any soil, it’s a precise blend of everything your plants need to look their best and produce abundantly. Because it’s listed by the Organic Materials Review Institute, you can be sure your organic food crops grown in this enriched soil remain blessedly chemical free.
The scientists at Black Gold have worked hard to create the very best combination of organic matter and drainage enhancers. The base is not filled with woody matter like low cost soils which can be notoriously low in nutrients. Ours is strictly created with sphagnum peat moss, compost and finely ground forest products for water retention and overall nutrition. To prevent packing down and ensure perfect drainage, optimal proportions of coarse perlite and pumice are incorporated for a moist, yet aerated root zone.
What really boosts this potting soil is the addition of screened worm castings, which contain a wide range of biological benefits. These byproducts of earthworms contain the very stuff of plant life: microscopic organisms that turn potting soil from a collection of organic matter into a living breathing soil teeming with microbes. Castings are also rich in minerals and micronutrients, which are so often lacking in man-made soils. The combination of organic matter, microbes and nutrients are three most important elements of the organic garden, driving the decomposition process that feeds plants naturally. Many of the microbes can also benefit plant growth, disease resistance and the ability to survive a dry spell.
So don’t buy one soil for your organic garden and another to power your flowers through the season when there’s a single organic product that does it all. The real benefit of such a perfect blend is its longevity, because living soil is literally self sufficient. It rarely requires replacement because this soil doesn’t wear out like cheaper brands that can never be coaxed to produce well the second or third season. Count on Black Gold Natural & Organic Potting Soil to remain fertile and well drained today and years down the road for a clean, chemical-free, sustainable garden.

Bulk Cedar Mulch 4 cy $249.95
& Bagged Cedar Mulch 2 cf $3.95

New Castle Gardens has Red Cedar Mulch available in 2 cf (cubic feet) bags or a 4 cy (cubic yard) compressed bale which fluffs up to 6 or 7 cubic yards. A compressed bale means you don’t pay for any air! Consider the value: the 4 cy cedar bale is the equivalent of 80+ 2 cf bags of cedar mulch. We will load the bale into the back of your pick-up or back of your trailer.
Why Mulch?
– Conserve soil
– Conserve water
– Provide consistent soil temperature for the day and night
– Barrier to new weed seeds that blow on the top of mulch
– Barrier to sprouting weeds growing from underneath
– Cedar Mulch with tannic acid repels crawling insects (think cedar chest!)
– Over time breaks down acting as compost to enrich the soil
– It’s a clean surface for walking or kneeling
– Provides a groomed “finished” appearance around your plants