How do you remember our winter so far this year? Rainy, chilly, downright cold?
Do not let a warm week in February allow you to think that winter is over. We can and most likely will have freezing temperatures this month and possible into March. Average last frost date is March 15 and remember – That is the AVERAGE!!! I just read that Chad Borseth from Native Seed Search and Facebook Group Tucson Backyard Gardening posted that he bases the last freeze being over by when his Mesquite tree blooms. Great tip from one of Tucson’s experts.
Potted Garden Tips for February:
Frosted or Frozen Plant Damage
- Do not be tempted to prune back frost damaged plants yet.
- We need to wait until the danger of frost is over (average date March 15)
- Watch for a surprise frost and cover tender annuals.
- Water both the day before and immediately after applying granular fertilizers.
- Use a granular fertilizer according to the directions on the package. Size and age of the trees determine how much fertilizer you use.
- Fertilize mature trees away the trunk, meaning the outer two thirds of the ground of the leaf canopy where the most active roots are.
- Give the trees a deep soaking watering after applying the fertilizer.
- Newly planted trees do not need fertilizer the first 1-2 years after planting).
- Note: Whether you use Ammonium Sulfate, Ammonium Phosphate or Citrus Food fertilizer it’s important to read instructions because the amount of fertilizer need per year will vary depending on the age, size, and type of citrus tree. For example, a medium-sized adult tree 5-6 years after planting needs 6.2 pounds of Ammonium Sulfate per year (split into three applications). Grapefruit trees 5 or more years after planting need half the amount for other citrus.
Source: Pima County Master Gardener Program
- Continue to pick your citrus. You do not need to harvest all of the fruit just because the trees come into flower. Grapefruit and Valencia oranges will continue to sweeten while left on the trees.
- Continue your bi-weekly fertilizing routine.
- Deadhead regularly and prune to shape plants.
- Blast your plants with a jet spray from about 4 feet away to deter pests and disease.
- Water potted cactus and succulents if you have not gotten ample rain. If you have registered an inch of rain in the last month, that is enough for now.
Roses (from the Rose Society of Tucson)
- Complete all pruning of your roses by mid-February.
- Once you’re done pruning, be sure to clean up all the old mulch and dead leaves and throw them in the trash, not your compost pile. Dead leaves can often have mildew spores and other diseases on them that can infest your compost pile and create problems later on.
- Apply both a pesticide and a fungicide to your pruned roses and the soil in the pots. Fungus spores such as mildew can live through the winter in your soil.
- Apply long-term or organic fertilizer, such as Max Magic Mix, Bandini Rose Food or homemade com-post. Also, it helps to add superphosphate at this time and apply a half cup of Epsom salts. Scratch it into the soil and water in.
- Two weeks following the long-term fertilizing, begin your regular short-term or liquid fertilizing program using a water soluble fertilizer such as Rapid Gro or Miracle Gro.
- Once growth appears, start in on your hose jet-spray regime to keep the aphids and mildew away.
- Continue to water your roses. As daytime temperatures increase, increase your watering frequency making sure the pot drains with each watering.
Have a beautiful month! February and March are our spring months and we want to get out and enjoy our splendid winter gardens!